This delicious crustless quiche is a casserole-style quiche made without crust. Customize it with spinach, bacon, broccoli, or other cheeses for special occasions or easy breakfast on the go.
Preheat oven to 350°F. Coat a 9 x 9 baking dish with cooking spray or oil. Set aside.Note: For air fryer ovens, preheat to 325°F on the "Bake" setting.
Heat OLIVE OIL in a large skillet over medium-high heat.
Add ONION and BELL PEPPERS. Sauté a few minutes to sweat off some moisture.
Add MUSHROOMS and GARLIC. Sauté until the mushrooms become tender.
Transfer this vegetable mixture to the baking dish.
Distribute the KALE and CHEESE over this mixture and set aside.
In a mixing bowl, whisk together EGGS, MILK, SALT, PEPPER, and THYME.
Pour egg mixture into the baking dish. Press kale under the surface as needed.
Bake uncovered 45-55 minutes (30 minutes for air fryer ovens) until the eggs are set.
Transfer quiche out of the oven. Allow to rest for 10 minutes before serving.
To store, cool completely and store in an airtight container for up to 5 days.