Crack eggs in a bowl and whisk in each ingredient, dairy, then flour until most of the lumps are smoothed out. Add salt, pepper and spices if using.
Note: You could bake and serve this mixture on its own.
In a skillet on medium heat, cook the filling ingredients until heated through and bubbling – approximately 15-20 minutes.
Heavily cover a deep-dish pie tin or an 8×8 inch cake pan with cooking spray, making sure it is well coated or the quiche will stick. Pour the cooked filing (2-3 cups) into the greased baking pan and spread lightly to distribute evenly. Top with the crustless quiche mixture and bake at 350 degrees for 40-45 minutes, until a knife comes out clean and the top is golden brown.