Heat oven to 350° F (177° C). Spread 1 tablespoon of olive oil on the bottom of a small 5-inch baking dish. Set aside.
Place the sliced zucchini, red bell peppers, onions, and broccoli in a small bowl. Toss the vegetables with the remaining olive oil, the herbs de Provence, salt, and pepper. Stir in the shredded cheese.
Pour the seasoned vegetables into the prepared baking dish. Bake for 30 minutes.
Enjoy warm.
Notes
Uniform Cutting: Ensure your vegetables are cut into even sizes to cook uniformly throughout the casserole.
Protein Boost: For extra protein, add a quarter-cup of cooked lentils or chickpeas to the mix.
Crunchy Topping: To add some crunch, sprinkle breadcrumbs over the casserole before baking.