Easy Crustless Spinach Quiche
Ingredients 1 tablespoon extra virgin olive oil 1 small sweet onion , diced 4 ounces mushrooms , sliced 2 cloves minced garlic 10 ounces chopped frozen spinach , thawed and drained 6 ounces crumbled feta cheese 8 ounces shredded cheddar cheese 5 large eggs 1/2 cup milk (1%, 2%, or whole) 1/4 teaspoon table salt ...