In a large bowl mix the onions, butter, mayo, sour cream, salt and garlic pepper.
Add the vegetables and mix until well coated.
Fold in the Ritz crackers and cheese and transfer the mixture to the baking pan.
Bake for 30-40 minutes or until vegetables are tender and cheese is melted.
Notes
Customize with Seasonings: Enhance the flavor of the casserole by experimenting with different seasonings or herbs. Consider adding smoked paprika, dried thyme, or crushed red pepper flakes for a flavor boost. Adjust the seasonings according to your taste preferences.
Crunchy Topping Variation: For an extra crunchy topping, mix the crushed Ritz crackers with melted butter before sprinkling them over the vegetable mixture. This creates a golden and crispy topping that adds texture contrast to the soft vegetables.
Add Protein: Boost the nutritional value of the casserole by incorporating protein-rich ingredients. Add cooked diced chicken, ham, or bacon to make it a heartier main dish. Alternatively, mix in cooked quinoa or white beans for a vegetarian-friendly option that adds protein and fiber.