Once the oven is preheated, bake your mini pie crusts for about 8 minutes
In a buttered medium-sized skillet, start browning your onions over medium heat.
Place the browned onions, broccoli, and cheddar cheese into your baked pie crusts (about 1 teaspoon of each ingredient).
Whisk together eggs, milk, and salt and pepper. Pour egg mixture into each of your mini crusts. Bake for about 15 minutes or until quiche is set. Allow to cool for 10 minutes before serving.