1-Begin by setting your oven to 400 degrees Fahrenheit to get it ready for baking This method ensures the frittata cooks evenly and comes out just right.

2-Next, heat the olive oil in a 9-inch or 10-inch oven-safe non-stick skillet over medium heat Add the red onion and scallions, cooking them until soft, which takes about 4 minutes. This step builds a flavorful base for the rest of the dish.

3-In a medium bowl, beat the 4 large whole eggs and 1 cup egg whites until well combined Add the 1/2 teaspoon salt, freshly ground black pepper to taste, 2 ounces crumbled feta cheese, 2 tablespoons grated Parmesan cheese, the sautéed onions, and 1 1/2 cups fresh chopped baby spinach. Mix everything together thoroughly.

4-Pour the egg mixture into the skillet and cook on the stovetop until the bottom sets, about 4 to 5 minutes Then, transfer the skillet to the preheated oven and bake for 4 to 5 minutes until it’s cooked through.

5-Once done, remove the frittata from the oven, transfer it to a plate, and cut it into 4 wedges Serve it warm, topped with diced grape or cherry tomatoes and extra scallions if you like. This quick process makes it a hit for busy parents or students.