Spinach and Mushroom Quiche

 

This healthy vegetarian quiche recipe is as simple as it gets. It's a quiche without the fussy crust! It's filled with sweet wild mushrooms and savory Gruyère cheese. Enjoy it for breakfast or brunch, or serve it with a light salad for lunch.

• tablespoons extra-virgin olive oil
• 8 ounces sliced fresh mixed wild mushrooms such as cremini, shiitake, button and/or oyster mushrooms
• 1 ½ cups thinly sliced sweet onion
• 1 tablespoon thinly sliced garlic
• 5 ounces fresh baby spinach (about 8 cups), coarsely chopped
• 6 large eggs
• ¼ cup whole milk
• ¼ cup half-and-half
• 1 tablespoon Dijon mustard
• 1 tablespoon fresh thyme leaves, plus more for garnish
• ¼ teaspoon salt
• ¼ teaspoon ground pepper
• 1 ½ cups shredded Gruyère cheese