Step 1

Preheat oven to 350 degrees Fahrenheit. For air fryer ovens, use the same temperature and select the bake setting.

Step 2

Coat a 12 x 10 baking dish with cooking spray or oil. Set aside.

Step 3

In a large skillet, heat OLIVE OIL over medium-high heat.

Step 4

Sauté GARLIC, GREEN ONION, and BELL PEPPERS until slightly tender.

Step 5

Add MUSHROOMS and KALE. Sauté until tender.

Step 6

Transfer cooked vegetables to the prepared baking dish and set aside.

Step 7

In a mixing bowl, whisk together EGGS, MILK, SALT, PEPPER, and THYME.

Step 8

Add egg mixture to the baking dish. Sprinkle CHEESE over the top.

Step 9

Bake uncovered 35-45 minutes in a conventional oven, or until eggs are set. For air fryer ovens, bake 25 to 30 minutes

Step 10

Carefully transfer quiche out of oven and rest for 5 minutes. Serve warm.

Step 11

To store, allow quiche to cool completely and store in an airtight container up to 5 days.