1-First Step: Preheat and prep the pan Start by preheating your oven to 350 degrees Fahrenheit. While the oven warms, grease a 12-cup muffin tin with butter or olive oil. This step matters because it helps the egg muffins release cleanly after baking. If you have a silicone muffin tin, that also works well and makes removal even easier. A silicone pan can be especially helpful for busy mornings when you want less cleanup and faster serving.

2-Second Step: Whisk the eggs Crack 12 eggs into a large bowl and whisk until the mixture looks smooth and well blended. Add 1/4 teaspoon sea salt and 1/8 teaspoon black pepper, then whisk again so the seasoning spreads evenly through the eggs. This gives your egg muffins with spinach and feta a balanced flavor from the start. If you are using fewer eggs, you can add a splash of cream for a richer texture. That small change can help the muffins stay soft and tender in the oven.

3-Third Step: Stir in the spinach Add 2 cups of roughly chopped spinach to the egg mixture and stir until the greens are evenly mixed in. The spinach should be lightly coated in the eggs so it distributes well in each muffin cup. If your spinach leaves are large, give them a quick chop so they bake into smaller bites. That makes the texture smoother and easier for kids, students, and anyone who likes a more even bite.

4-Fourth Step: Fill the muffin cups Spoon the mixture into the prepared muffin tin, filling each cup about halfway. This gives the eggs room to puff while baking and keeps the muffins from overflowing. Once the cups are filled, top each one with crumbled feta cheese. For the best look, try to spread the feta evenly so every muffin gets a little salty bite. If you want stronger cheese flavor, you can press a few extra crumbles into the top of each cup before baking.

5-Fifth Step: Bake until set Bake the spinach egg muffins with feta for 18 to 20 minutes, or until the centers are set. The tops should look firm and lightly puffed, and a knife inserted into the center should come out mostly clean. Try not to overbake, since eggs can become rubbery if left in the oven too long. Oven times can vary a bit, so begin checking near the 18-minute mark. If you bake them in a dish instead of a muffin tin, the time may need to be adjusted depending on the dish depth and size.

6-Final Step: Serve or store Let the muffins cool for a few minutes, then serve right away if you want them warm. They also store well in an airtight container in the fridge for up to 5 days, which makes them a great meal prep breakfast. You can reheat one or two in the microwave for a quick morning meal, or pack them for school, work, or travel. These easy egg muffins are especially useful when you want something ready fast with very little effort.