Roll out the chilled dough on a floured surface to fit your pie dish (approximately 9-10 inches in diameter).
Carefully transfer the dough to the pie dish, pressing it gently against the bottom and sides.
Prick the bottom of the crust with a fork to prevent it from puffing up during baking.
Sprinkle half of the grated cheddar cheese over the bottom of the crust.
Add the steamed broccoli, sautéed onion and red bell pepper, and halved cherry tomatoes on top of the cheese.
Pour the egg and milk mixture over the vegetables.
Sprinkle the remaining cheese on top.