Preheat the oven to 350 F and spray a baking dish with cooking oil spray.
In a mixing bowl, beat the 6 large eggs together with the 1/2 cup milk of choice, seasonings (1 teaspoon onion powder, 1 teaspoon garlic powder, 1 teaspoon Italian seasoning, and 1/4 cup fresh parsley.
Stir in the 2 cups cooked quinoa, 1 large red bell pepper, 12 ounces broccolini or broccoli, and 1 1/2 cups cheddar cheese.
Spoon the mixture into the prepared baking dish, taking care not to mess around the edges too much. (That is if you care about the looks of your casserole.)
Cover the dish with aluminum foil. Bake for 45 minutes or until the egg is cooked through and broccolini is tender.
Notes
Variations, Add-ins, and toppings for quinoa broccoli recipes:
Diced protein like chicken, sausage, or leftover turkey