Combine eggs, drained cottage cheese, shredded cheese, chilis, peppers, mushrooms, flour, and baking powder and beat until smooth with a wire whisk. Pour into a well-greased quiche pan.
Bake for 10 minutes.
Remove from oven and garnish with 8 small tomato slices placed evenly around quiche.
Return to oven, reduce temperature to 350°F and bake 20 minutes longer.