Crustless Quiche with Spinach and Mushrooms

From The Mediterranean Dish here. Ingredients 5 eggs 1 cup whole milk 4 ounces Fontina cheese or mozzarella 1 tablespoon extra virgin olive oil, plus more for the pan 8 ounces sliced mushrooms ½ medium yellow onion, minced 3 large cloves garlic, minced 1 teaspoon dried thyme 1 teaspoon kosher salt ½ teaspoon black pepper 1 ½ tablespoons balsamic vinegar 2 cups packed baby … Continue reading