Use a shallow-sided 9-inch glass pie plate. Place the pie crust in the plate and crimp the edges. Double-folded the edges of the crust and then crimped. Poke the bottom of the pie crust to let air vent out. Prebake the crust for 10-12 minutes.
Allow to cool a bit then place the broccoli and cheese on the bottom of the pie crust.
In a medium bowl, mix the milk, eggs, salt, pepper, and garlic. Pour over the broccoli and cheese.
Bake for 40-45 minutes. Check if it's done by inserting a knife in the center. If it comes out clean, take the quiche out of the oven.
Let stand for 5-10 minutes before serving.