Zucchini Cheese Quiche

Made this for a baby shower a couple weeks ago...yummy!!
Thanks Best Bites for another yummy quiche.

1 single 9" pie crust
1 lb zucchini, thinly sliced (about 3 small-medium zucchini)
1 Tbs butter
1/2 C diced red onion
3 cloves garlic, pressed or finely minced
kosher salt
black pepper
3 eggs

1/2 Tbs dijon mustard
1 1/2 Tbs fresh chopped oregano (or 1 1/2 tsp dry)
1/8 - 1/4 tsp red pepper flakes
5 oz gruyere cheese
1/4 C grated Parmesan cheese

Preheat oven to 375 degrees.

Place rolled out pie crust in a 9" pie plate and flute edges.  Place in fridge until ready to use.

In a large skillet on the stove-top, melt butter.  Add onions and garlic and cook for about 1 minute, stirring frequently.  Add sliced zucchini and add a sprinkle of salt (about 1/2 tsp) and a few cracks of black pepper.  Cook, stirring occasionally, for 3-4 minutes until zucchini is softened.  Remove pan from heat and set aside.

In a separate bowl lightly beat eggs.  Add dijon mustard, oregano, red pepper flakes.  Whisk until combined and then gently stir in Gruyere cheese.

Add egg and cheese mixture to zucchini mixture and toss until combined.  Place mixture in prepared pie crust and sprinkle Parmesan cheese on top.

Bake for 40-50 minutes or until center is set and top is lightly golden.  Cool for at least 15 minutes before cutting.  Can be served warm, at room temp, or even cold.