Preheat oven to 350. In a pan heat oil and saute onion, tomato, garlic and sweet peppers. Cook for 10 minutes, then stir in quinoa and cook uncovered for 2 minutes.
Add 3 Cups of water and salt and pepper and reduce heat to medium and cook for 15 minutes. Remove from heat and let stand for 5 minutes
Beat eggs and ricotta in a bowl, add mustard powder and cheeses. Gently fold in quinoa and vegetables. Spray baking dish with cooking spray, and pour entire mixture in, mixture with red pepper flakes if using, and then sprinkle with Panko bread crumbs. Add a little bit of mozzarella and cheddar that you have left on top and bake for 25-30 minutes.
Remove from oven and let sit for 5-10 minutes before serving