Tex-Mex Keto Squash Casserole
Tex-Mex Keto Squash Casserole is a deliciously cheesy and creamy dish that adds a unique twist to your meal. This low-carb casserole is perfect for family gatherings or potlucks, providing a satisfying side that everyone will love. With its vibrant flavors and comforting texture, it stands out as an ideal choice for those looking for healthy yet indulgent options.
Why You’ll Love This Recipe
- Flavorful Fusion: The combination of summer squash, cheddar cheese, and zesty tomatoes creates a delightful taste experience.
- Low Carb Delight: Perfect for keto dieters, this casserole keeps carbs low while maintaining rich flavors.
- Easy Preparation: With just a few simple steps, you can whip up this dish in no time, making it ideal for busy weeknights.
- Versatile Side Dish: This casserole pairs well with grilled chicken, beef, or turkey, making it suitable for any meal.
- Crowd-Pleasing Appeal: Its cheesy goodness makes it a hit at parties, ensuring there’s never a leftover.
Tools and Preparation
Before you start cooking your Tex-Mex Keto Squash Casserole, gathering the right tools can make the process smoother. Here’s what you’ll need:
Essential Tools and Equipment
- Large skillet
- Medium-sized casserole dish
- Mixing bowl
- Knife and cutting board
Importance of Each Tool
- Large skillet: Ideal for cooking the squash and onions evenly without overcrowding.
- Medium-sized casserole dish: Provides ample space for mixing and baking your casserole to perfection.
- Mixing bowl: Essential for combining ingredients effortlessly and preventing spills during preparation.

Ingredients
Cheesy, creamy and low carb squash casserole makes the perfect side dish.
Ingredients:
– 1 tsp olive oil
– 2 pounds summer squash, sliced
– 1 cup diced onion
– 1 can rotel tomatoes, drained (may use mild if desired)
– 1 ½ cups cheddar cheese, grated (reserve 1/2 cup for topping)
– ½ cup sour cream
– ½ cup mayonnaise
– ¼ tsp salt
– ¼ tsp black pepper*
How to Make Tex-Mex Keto Squash Casserole
Step 1: Preheat the Oven
Preheat your oven to 350 degrees Fahrenheit. This ensures that your casserole cooks evenly.
Step 2: Cook the Vegetables
- Heat the olive oil in a large skillet over medium heat.
- Add the sliced summer squash and diced onion.
- Cook and stir occasionally until tender—about 8-10 minutes.
- Drain any excess liquid from the cooked squash mixture.
Step 3: Combine Ingredients
In a large mixing bowl:
* Stir together the drained squash/onion mixture with remaining ingredients (reserve 1/2 cup cheese).
* Adjust salt and pepper according to your taste preferences.
Step 4: Assemble the Casserole
Pour the mixture into a medium-sized casserole dish. Sprinkle the reserved cheese over the top to create a cheesy crust.
Step 5: Bake Your Casserole
Place your assembled casserole in the preheated oven:
* Bake until cheese is melted and the casserole is bubbly—around 20-30 minutes.
* Allow it to set for about 5-10 minutes before serving.
Enjoy your flavorful Tex-Mex Keto Squash Casserole!
How to Serve Tex-Mex Keto Squash Casserole
This delicious Tex-Mex Keto Squash Casserole is versatile and can be paired with a variety of dishes or enjoyed on its own. Here are some serving suggestions to elevate your meal.
As a Standalone Dish
- Enjoy it hot as a hearty side dish at dinner.
- Top with fresh cilantro or avocado for added flavor.
With Grilled Protein
- Serve alongside grilled chicken or turkey for a complete meal.
- Pair with beef tacos for a fun twist on Tex-Mex night.
On a Bed of Greens
- Place the casserole over mixed greens for a refreshing salad.
- Add sliced tomatoes and cucumbers for extra crunch.
Accompanied by Dips
- Pair with guacamole or salsa for added flavor and texture.
- Serve with a side of sour cream to balance the spiciness.
How to Perfect Tex-Mex Keto Squash Casserole
Perfecting your Tex-Mex Keto Squash Casserole is easy with a few simple tips. Here’s how to make it even better.
- Use Fresh Ingredients: Fresh summer squash and onions enhance the flavor and texture of the casserole.
- Adjust Cheese Levels: Feel free to experiment with different types of cheese, like pepper jack, for extra kick.
- Drain Properly: Make sure to drain any excess liquid from the squash to prevent a watery casserole.
- Customize Spices: Add some chili powder or cumin for an extra layer of flavor that complements the Tex-Mex theme.
- Let It Rest: Allowing the casserole to set for 5–10 minutes after baking helps it firm up before serving.
Best Side Dishes for Tex-Mex Keto Squash Casserole
Complement your Tex-Mex Keto Squash Casserole with these tasty side dishes that enhance its flavors. Each option adds something special to your meal.
- Grilled Chicken Fajitas: Thinly sliced chicken stir-fried with bell peppers and onions, seasoned with fajita spices.
- Cauliflower Rice: Lightly sautéed cauliflower rice makes for a low-carb alternative that pairs well with the casserole.
- Zucchini Noodles: Spiralized zucchini tossed in olive oil and garlic adds freshness without extra carbs.
- Mexican Street Corn Salad: A mix of corn, lime, cilantro, and spices brings vibrant flavors to your table.
- Avocado Salad: Sliced avocados, tomatoes, and red onion drizzled with lime juice create a refreshing contrast.
- Sautéed Green Beans: Crisp-tender green beans sautéed in garlic add a crunchy texture that complements the creamy casserole.
Common Mistakes to Avoid
Making the perfect Tex-Mex Keto Squash Casserole can be simple, but there are common pitfalls to watch for.
- Overcooking the squash: If you cook your squash too long, it can become mushy. Aim for 8-10 minutes until tender.
- Ignoring drainage: Failing to drain excess liquid from the squash can make your casserole watery. Always drain well before mixing.
- Not reserving cheese for topping: Skipping this step can lead to less crispy and flavorful cheese on top. Make sure to hold back half a cup of cheese.
- Skipping seasoning adjustments: Each ingredient may vary in flavor, so taste and adjust salt and pepper as needed for the best results.
- Baking at incorrect temperature: Baking at temperatures lower than 350 degrees can prevent the casserole from bubbling properly. Always preheat your oven.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Consume within 3-5 days for optimal freshness.
Freezing Tex-Mex Keto Squash Casserole
- Freeze in a freezer-safe container or wrap tightly in plastic wrap.
- Best consumed within 2-3 months for quality.
Reheating Tex-Mex Keto Squash Casserole
- Oven: Preheat to 350°F and bake for about 15-20 minutes until heated through.
- Microwave: Heat in short intervals, about 1-2 minutes, stirring in between until hot.
- Stovetop: Reheat over low heat in a skillet, stirring frequently until warmed through.
Frequently Asked Questions
Here are some common questions about making the Tex-Mex Keto Squash Casserole.
Can I use different types of cheese?
Yes! Feel free to experiment with other cheeses like Monterey Jack or Pepper Jack for added flavor.
Is this casserole suitable for meal prep?
Absolutely! The Tex-Mex Keto Squash Casserole is great for meal prep and reheats well.
What can I serve with Tex-Mex Keto Squash Casserole?
This dish pairs nicely with grilled chicken or beef and a fresh salad for a complete meal.
How do I customize my Tex-Mex Keto Squash Casserole?
You can add different vegetables like bell peppers or zucchini, or toss in some cooked ground turkey or beef for extra protein.
Final Thoughts
The Tex-Mex Keto Squash Casserole is a delightful dish that combines cheesy goodness with healthy ingredients. Its versatility allows you to customize it according to your preferences, making it a fantastic addition to any meal plan. Give it a try today!

Tex-Mex Keto Squash Casserole
Tex-Mex Keto Squash Casserole is a creamy, cheesy delight that brings a burst of flavor to any meal while keeping it low in carbs. This casserole combines tender summer squash with zesty tomatoes and rich cheddar cheese, all baked to perfection for a satisfying side dish that everyone will love. It’s perfect for family gatherings, potlucks, or even weeknight dinners when you want something indulgent yet healthy.
- Total Time: 45 minutes
- Yield: Serves approximately 6 people 1x
Ingredients
- 1 tsp olive oil
- 2 pounds summer squash, sliced
- 1 cup diced onion
- 1 can Rotel tomatoes, drained
- 1 ½ cups grated cheddar cheese (reserve ½ cup for topping)
- ½ cup sour cream
- ½ cup mayonnaise
- ¼ tsp salt
- ¼ tsp black pepper
Instructions
- Preheat your oven to 350°F.
- In a large skillet, heat the olive oil over medium heat. Add the sliced summer squash and diced onion, cooking until tender (about 8–10 minutes). Drain excess liquid.
- In a mixing bowl, combine the drained squash mixture with Rotel tomatoes, cheddar cheese (reserve half), sour cream, mayonnaise, salt, and pepper.
- Pour the mixture into a medium casserole dish and top with reserved cheese.
- Bake for 20–30 minutes until bubbly and golden. Let sit for 5–10 minutes before serving.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: Tex-Mex
Nutrition
- Serving Size: 1 serving
- Calories: 230
- Sugar: 3g
- Sodium: 420mg
- Fat: 18g
- Saturated Fat: 7g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 9g
- Fiber: 3g
- Protein: 8g
- Cholesterol: 40mg