Cheesy Zucchini and Corn Casserole

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A tender vegetable casserole with grated zucchini, sweet corn, and melted cheese, baked until golden. A nutritious side dish that kids request at dinner. This American-inspired kid-friendly recipe, ready in about 45 minutes, pairs zucchini, frozen corn, shredded cheddar cheese for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 20 min Cook: 25 min Serves 6 American cuisine 280 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). Grease a 9x9-inch baking dish.
  2. Step 2: Grate 2 medium zucchinis (about 2 cups) and thaw 1 cup frozen corn.
  3. Step 3: In a medium saucepan, melt 1/4 cup butter over medium heat. Whisk in 2 tbsp all-purpose flour and cook for 1 minute.
  4. Step 4: Gradually whisk in 1/2 cup milk, stirring until thickened (about 5 minutes).
  5. Step 5: Stir in 1/4 tsp garlic powder, 1/4 tsp onion powder, 1/4 tsp salt, and 1/8 tsp black pepper.
  6. Step 6: Mix in the grated zucchini and corn, then transfer to the prepared baking dish.
  7. Step 7: Sprinkle 1 cup shredded cheddar cheese and 1/4 cup breadcrumbs over the top.
  8. Step 8: Bake for 25-30 minutes until bubbly and the top is golden.

Frequently asked questions

How long does Cheesy Zucchini and Corn Casserole take to make?

Total time is about 45 minutes (20 min prep + 25 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Cheesy Zucchini and Corn Casserole?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep zucchini from drying out.

Can I substitute ingredients in Cheesy Zucchini and Corn Casserole?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Cheesy Zucchini and Corn Casserole for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Cheesy Zucchini and Corn Casserole?

American kid friendly like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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