Saute broccoli, bell peppers and onion in a cast iron skillet or frying pan in about a teaspoon of oil. (I saute each veggie separately as I like them cooked to different degrees. I cook my broccoli until the edges are just browned, pepper just slightly, so they still have some bite, about 1 -2 minutes, and onion until slightly browned.
Place vegetables into the crust.
Beat together the eggs, milk, and salt in a bowl.
Pour egg mixture over veggies.
Bake 25-30 minutes, until an inserted knife comes out clean.
Notes
Milk: You can substitute any dairy-free milk for the hemp milk. Regular milk will work as well, but of course the resulting quiche won't be dairy free. This Easiest Homemade Coconut Milk or Homemade Almond Milk would work perfectly.
Sun-Dried Tomatoes: For sun-dried tomatoes, look for a brand with no added ingredients or make your own Homemade Sun-Dried Tomatoes.
Mini Quiche Option: Make this quiche in a mini muffin tin or cut into squares after making it in a baking pan for a tasty appetizer.
Cauliflower Crust Option: If you're grain free or eating a low-carb diet, you can substitute cauliflower rice for the quinoa and flour in the crust. Simply cook the cauliflower rice, then squeeze out as much of the water as possible. Next, add in the remaining crust ingredients and proceed with the recipe.