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baked squash casserole in skillet
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Easy Keto Squash Casserole

Fresh yellow squash combined with butter, cheddar cheese, and mayonnaise creates the best squash casserole!  A perfect blend of seasonings adds amazing flavor.
Course Side Dish
Cuisine American
Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings 6
Calories 282kcal
Author Anne Clark

Equipment

  • Sharp kitchen knife
  • Cutting board
  • large pot
  • colander
  • measuring spoons
  • measuring cup
  • Casserole dish or skillet

Ingredients

  • 1-½ lbs yellow squash (fresh or frozen)
  • 1 tablespoon salted butter
  • ½ cup frozen chopped onion, bell pepper, and celery mixture
  • ¼ cup full fat mayonnaise
  • ¼ teaspoon garlic powder
  • ½ teaspoon salt (test flavor before baking, add salt if needed)
  • teaspoon pepper
  • 1 cup shredded cheddar cheese
  • fresh parsley for garnish

Instructions

  • Preheat oven to 350F.
  • Place the sliced squash into a large pot. Add just enough water to cover squash. Bring to a boil, then lower heat and simmer the squash for 5 minutes. Drain squash in a colander and let it stay in the colander for now.
  • Melt butter in a small skillet. Add the frozen chopped onion, bell pepper, and celery mixture. Simmer on medium-low heat for 5 minutes or until tender. Turn off heat. Add mayonnaise, salt, garlic powder, and pepper. Mix well.
  • Add cooked squash and cheese to skillet. Mix well. Taste test for flavor and add salt, if desired.
  • Bake uncovered for 30-35 minutes, or until slightly browned. Garnish with fresh parsley and extra cheese if desired.

Notes

Use a mini food chopper to finely mince the onion and celery. 
The recipe can be doubled and baked in a 9" x 13" baking dish.

Nutrition

Serving: 1serving | Calories: 282kcal | Carbohydrates: 11g | Protein: 10g | Fat: 23g | Saturated Fat: 9g | Polyunsaturated Fat: 7g | Monounsaturated Fat: 5g | Trans Fat: 0.1g | Cholesterol: 42mg | Sodium: 604mg | Potassium: 537mg | Fiber: 3g | Sugar: 4g | Vitamin A: 2222IU | Vitamin C: 32mg | Calcium: 235mg | Iron: 1mg