Preheat your oven to 350°F (175°C). Lightly grease a standard 12-cup muffin tin with nonstick spray.
Divide the spinach, red bell pepper, green bell pepper, and tomatoes evenly among the muffin cups.
In a large bowl or measuring cup, whisk together the eggs, egg whites, salt, basil, oregano, and black pepper until smooth and combined.
Carefully pour the egg mixture into each muffin cup until about three-quarters full.
Sprinkle feta cheese evenly over the tops.
Bake the Egg Muffins for 24–28 minutes, or until the centers are fully set.
Allow the muffins to cool for several minutes. Run a butter knife around the edges to loosen and remove from the pan.
Serve warm with avocado, salsa, or fresh parsley if desired.
Tips & Tricks
Use silicone muffin liners for easy removal.
Don’t overfill the muffin cups to prevent spilling.
Add cooked mushrooms, onions, or turkey ham for extra flavor.
Store in batches for easy grab-and-go breakfasts.
Reheat gently to keep the egg muffins fluffy.