
Cook the Onion and Garlic
Sauté the onion until softened and lightly golden, adding the garlic near the end so it stays fragrant.

The zucchini still has a little texture when it goes into the dish, because it will soften further in the oven. Sour cream gives the filling lift, and the cheddar turns the corners browned and irresistible.
This Zucchini Cheese Bake is creamy, cheesy, and baked until lightly golden with tender zucchini, sautéed onions, garlic, and fluffy sour cream filling layered throughout! Rich enough to feel comforting but light enough for summer suppers, it’s an easy casserole that pairs especially well with grilled meats, roast chicken, or fresh garden meals.

I like the zucchini to still hold a little texture before it goes into the oven because it softens more than people expect while it bakes. The browned cheesy corners around the edge never last very long once supper starts.

Sauté the onion until softened and lightly golden, adding the garlic near the end so it stays fragrant.

Sauté the zucchini until barely tender, browned in spots, and the skillet is nearly dry.

Beat the egg whites to glossy stiff peaks and fold them gently into the seasoned sour cream mixture.

Layer the vegetables and cream mixture in the baking dish, top with sharp cheddar, and bake until set and lightly browned.
Let the casserole rest briefly so the filling settles before serving.

The zucchini still has a little texture when it goes into the dish, because it will soften further in the oven. Sour cream gives the filling lift, and the cheddar turns the corners browned and irresistible.
Scaling note: Scaling is withheld until recipe-specific quantities, method safety, and instruction synchronization are verified.
6 servings — Serving size: About 1/6 of casserole
Some ingredients could not be modeled and may meaningfully change the totals. Treat these values as a rough estimate.
Loading approved reviews…
Send ingredient, instruction, or correction questions to the recipe inbox.