Ingredients

• 1 tablespoon butter
• 2 teaspoons olive oil
• 1 small onion , diced
• 0.75 cups heavy whipping cream
• 3 eggs
• salt and ground black pepper to taste
• 0.75 cups shredded mozzarella cheese
• 0.25 cups grated Parmesan cheese

Instructions

1. 1 Preheat the oven to 350 degrees F (175 degrees C). Grease an 8-inch square baking dish or pie pan.
2. 2 Heat butter and olive oil in a skillet over medium-high heat; add onion. Cook and stir until softened, about 10 minutes; transfer onion to a plate to cool.
3. 3 Whisk cream, eggs, salt, and black pepper in a bowl; stir in mozzarella cheese, Parmesan cheese, and onion. Pour mixture into the prepared baking dish.
4. 4 Bake in the preheated oven until eggs are set and a knife inserted in the center comes out clean, about 35 minutes. It should be light brown around the edges but not brown on top.

Nutrition per serving