Preheat your oven to 375 degrees F and grease a 9" pie plate or line it with parchment paper.
Chop your veggies and set aside. Use two cups of your favourite veggies.
Add all remaining ingredients in a medium mixing bowl and whisk to combine. Then fold in the chopped veggies.
Transfer the mixture to your pie plate and smooth out the top with a silicone spatula. Bake for 30-35 minutes, until the edges are brown and the middle is set. A toothpick inserted in the middle should come out mostly clean, but not completely dry.
Remove from the oven and let cool for at least 15 minutes before slicing and serving. As the frittata cools it will further set and slice easier.
You may sub any of the veggies to suit your preference, but don't use more than 2 cups of chopped veggies.Do not overcook your frittata. For best results and texture, bake until a toothpick inserted in the middle comes out mostly clean, but NOT completely dry. It will continue to set as it cools.Let your frittata rest at room temperature for at least 15 minutes (a little longer is even better) before slicing and serving. The cool down time will help your omelet firm up and make the texture, just right.Leftovers keep refrigerated in a sealed container for 3-4 days. You may reheat or enjoy chilled.