Preheat oven to 350 degrees. Spray a 13x9 inch glass pan with cooking spray.
Break biscuits into 3-4 pieces each and arrange them in the bottom of the pan, spacing them evenly.
In a large bowl, whisk the eggs, then add milk, chopped veggies, and cheese and whisk to combine.
Pour egg mixture over biscuits, using a spatula to spread it out evenly if needed.
Bake uncovered for 45-50 minutes until cooked through and a knife comes out clean from the center.