Step 1: Preheat the oven
Preheat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish with cooking spray or butter and set it aside.
Step 2: Cook the vegetables
Bring a large pot of water to a boil.
Add the broccoli florets, cauliflower florets, and baby carrots. Once the water returns to a boil, reduce the heat and simmer for 8–10 minutes, or until the vegetables are just fork-tender.
Drain the vegetables thoroughly and allow any excess moisture to evaporate.
Step 3: Prepare the garlic cheese sauce
While the vegetables are cooking, melt the butter in a large skillet over medium heat.
Add the minced garlic and cook for approximately 20 seconds, stirring constantly until fragrant.
Whisk in the cornstarch and cook for another minute.
Gradually pour in the heavy cream, whisking continuously to prevent lumps.
Bring the mixture to a gentle boil and cook for 3–4 minutes, stirring frequently, until the sauce thickens.
Step 4: Add the seasonings and cheese
Remove the skillet from the heat.
Stir in the dried Italian seasoning, salt, black pepper, chili powder, and ground nutmeg.
Add the shredded Italian cheese and whisk until completely melted and smooth.
Taste the sauce and adjust the seasonings if needed.
Step 5: Assemble the casserole
Spread approximately ½ cup of the prepared cheese sauce over the bottom of the greased baking dish.
Add the drained vegetables and season lightly with salt and pepper.
Pour the remaining cheese sauce over the vegetables and gently stir until everything is evenly coated.
Sprinkle the panko breadcrumbs evenly across the top.
Step 6: Bake the casserole
Place the Creamy Vegetable Casserole Recipe in the preheated oven.
Bake for 20–23 minutes, or until the cheese sauce is bubbling around the edges and the breadcrumb topping is lightly golden.
For an extra-crispy topping, broil briefly at the end, watching carefully to prevent burning.
Step 7: Rest and serve
Remove the casserole from the oven and allow it to rest for approximately 10 minutes.
This helps the sauce settle and makes the casserole easier to serve.
Taste, adjust the seasoning if necessary, and serve warm.