Preheat oven to 350 degrees F.
Have pie tin ready with pie crust already prepared.
In a large bowl, beat eggs. Add yogurt and milk and mix again till combined. Add cheese and briefly stir to combine. Add salt and pepper to taste.
Add in no more than 2 cups of the mix in options. For example, use 1 cup chopped ham, 3/4 cup chopped kale, lightly packed, and 1/4 cup green onion.
For a 9 inch pie pan, bake for 50-60 minutes or until the center of the quiche is set when gently jiggled. If edges begin to brown too quickly cover loosely with foil.
If making individual quiches use approximately 4-5 6-ounce ramekins and bake for 35-45 minutes.