Step-by-Step Instructions
Preheat the Oven: Start by preheating your oven to 350°F (175°C).
Prepare the Vegetables: In your skillet, heat the olive oil over medium heat. Add the chopped onion and garlic, sautéing for about 3-4 minutes until they are soft and fragrant.
Whisk the Eggs: In a mixing bowl, whisk together the eggs, milk, and half of the Parmesan cheese. Season with salt and pepper to taste.
Combine Ingredients: Once the onions are ready, add the chopped arugula to the skillet. Stir to combine and let it wilt for about a minute. Then pour the egg mixture over the vegetables.
Cook on the Stovetop: Cook the frittata on the stovetop for about 2-3 minutes, gently lifting the edges with a spatula to allow uncooked egg to flow underneath.
Bake the Frittata: Sprinkle the remaining Parmesan cheese on top, then transfer the skillet to the preheated oven. Bake for 10-12 minutes, or until the frittata is set and lightly golden on top.
Let it Stand: Remove the frittata from the oven and let it stand for about 5 minutes before slicing.
Serve: Cut into wedges and serve warm or at room temperature. Enjoy it with a light salad or crusty bread.