Preheat oven to 375℉.
Gather and measure all ingredients. Eggs and milk should be at room temperature.
Pre-bake the pie crust for 10 minutes or until it turns light golden brown, and then set it aside to cool. Pre-baking the crust in itself helps prevent the crust from becoming soggy. Here are two more tips to help prevent a soggy crust: Brush the crust with a beaten egg or spread cheese on the bottom of the pie crust.
Place the pie crust onto a small cookie sheet. Layer your cheese, broccoli, and onion in the pie crust.
Whisk eggs for a few minutes. Before adding the half and half add 1 tablespoon of cornstarch to the milk and whisk making sure the two are well blended. Combine milk with eggs and whisk vigoursly.
Add salt, black pepper, and nutmeg. Whisk to incorporate.
Pour the egg mixture over the broccoli, cheddar cheese, and onions.
Place in the pre-heated oven and bake for aproximately 45 minutes, Ovens bake at different rates so sart checking for oven browning at 30 minutes. If the crust or quiche is browning too fast. drape a sheet of aluminum foil over the pie to reflect heat slowing down the browning process..
To check if the quiche is done, insert a knife in the center. If it comes out clean, the quiche is done. You can also check by observing the center of the quiche - if it jiggles or appears loose, continue baking. If the center stays still and appears to be completely set, the quiche is done.