Follow these simple steps to create perfectly baked, flavorful mini vegetable frittatas:

Step 1: Preheat the Oven and Prepare Muffin Tin

Begin by preheating your oven to 375°F (190°C). This ensures the oven is at the correct temperature when you place the frittatas in, allowing for even cooking. While the oven is preheating, lightly grease a standard 12-cup muffin tin with olive oil or cooking spray. This prevents the frittatas from sticking to the tin and makes them easy to remove after baking. You can also use silicone muffin liners for even easier cleanup.

Step 2: Sauté the Vegetables

Heat olive oil in a skillet over medium heat. Add your diced onions and cook for a few minutes until softened and translucent. Then, add the minced garlic and cook for another minute until fragrant, being careful not to burn it. Next, add the rest of your chosen vegetables (such as bell peppers, zucchini, mushrooms, broccoli, etc.) to the skillet. Sauté the vegetables until they are tender-crisp, usually about 5-7 minutes, depending on the type and size of vegetables. Season with salt and pepper to taste while they are cooking. Sautéing the vegetables beforehand is crucial as it softens them, enhances their flavor, and removes excess moisture, preventing soggy frittatas.

Step 3: Whisk the Eggs and Milk

In a large mixing bowl, crack the eggs. Add the milk (or cream/dairy-free alternative), salt, pepper, and any dried herbs you are using (like Italian seasoning or oregano). Whisk everything together thoroughly until the eggs and milk are well combined and slightly frothy. Whisking incorporates air into the mixture, which helps create a lighter and fluffier frittata texture.

Step 4: Combine Vegetables and Egg Mixture

Once the vegetables are sautéed and slightly cooled, add them to the bowl with the whisked egg mixture. Gently stir everything together to evenly distribute the vegetables throughout the egg mixture. If you are using cheese, now is the time to add about half of the shredded cheese to the mixture and stir it in. Reserving some cheese for the top allows for a nice cheesy crust.

Step 5: Fill the Muffin Cups

Carefully pour or spoon the egg and vegetable mixture into the prepared muffin tin, filling each cup about two-thirds to three-quarters full. Do not overfill the cups, as the frittatas will puff up slightly while baking and you want to avoid them overflowing.

Step 6: Bake the Mini Frittatas

Sprinkle the remaining shredded cheese evenly over the tops of the frittatas in the muffin tin. Place the muffin tin in the preheated oven and bake for 18-22 minutes, or until the frittatas are set and lightly golden brown on top. A toothpick inserted into the center of a frittata should come out clean when they are done. The baking time may vary slightly depending on your oven and the size of your vegetables.

Step 7: Cool and Serve

Once baked, remove the muffin tin from the oven and let the mini frittatas cool in the tin for a few minutes. This allows them to firm up slightly and makes them easier to remove. After a few minutes, gently loosen the edges of the frittatas with a knife or spatula and carefully remove them from the muffin tin. Serve them warm or at room temperature.