Cauliflower Parmigiana with Gruyère Sauce

Preheat the oven to 425 degrees F (220 degrees C). Grease an 8x10-inch oval casserole dish.

Bring a large pot of salted water to a boil. Add cauliflower florets and boil for 3 minutes. Drain.

Cut the florets into slices and arrange in the baking dish. Scatter red bell pepper pieces on top.