How to Make Freezer-Friendly Breakfast Cups with Spinach and Egg

Preheat and prep the pan

Position rack in the center of your oven and preheat to 375 °F (190 °C). Generously grease a standard 12-cup muffin tin with non-stick spray or brush with melted butter, ensuring every ridge is coated so the egg cups release cleanly.

Sauté the vegetables

Heat 1 teaspoon olive oil in a non-stick skillet over medium heat. Add ½ cup finely diced red bell pepper and cook 2 minutes until just softened. Toss in 3 packed cups baby spinach and a pinch of salt; cook until wilted, about 1 minute. Transfer to a plate and cool 5 minutes; excess heat can scramble the eggs when mixed.

Whisk the base

In a large bowl, whisk 8 large eggs until the yolks and whites are completely homogenous. Whisk in ¼ cup whole-milk Greek yogurt, 1 teaspoon Dijon mustard, ½ teaspoon kosher salt, and ¼ teaspoon freshly ground black pepper until silky; this incorporates air for extra lift.

Fold in the add-ins

Gently stir the cooled spinach-pepper mixture into the egg base along with ¾ cup shredded sharp cheddar. Mix just until combined; over-mixing can toughen the eggs.

Portion evenly

Using a ¼-cup spring-loaded ice-cream scoop or ladle, divide the mixture among the 12 muffin cups, filling each about ¾ full. The cups will puff, so leave room at the top.

Bake until just set

Bake 16–18 minutes, rotating the pan halfway through, until the centers are barely set and spring back when lightly touched. They will continue cooking from residual heat, so pull them when a tiny wobble remains.

Cool strategically

Let the cups rest 5 minutes in the pan; steam loosens the edges. Run a thin silicone spatula or butter knife around each cup, then lift out onto a wire rack to cool completely—critical for freezing, as trapped steam creates ice crystals.

Freeze for later

Arrange cooled cups on a parchment-lined sheet pan and freeze 1 hour. Once solid, transfer to a labeled zip-top bag; they won’t stick together and you can grab single servings.

Expert Tips

Use silicone molds for pop-out ease

A silicone muffin pan on top of a rigid sheet pan eliminates sticking entirely; simply peel away the molds after cooling.

Squeeze spinach bone-dry

Whether fresh or frozen, watery spinach leaks into the custard and creates rubbery edges. Press between paper towels until no liquid seeps.

Reheat low and slow

Microwave on 50 % power for 60–75 seconds, or bake at 300 °F for 10 minutes. High heat blasts moisture out, leaving rubbery eggs.

Double-batch smarter

Bake two dozen, cool, then freeze in two different seasonings—one Tex-Mex with pepper jack, one Italian with parmesan—so variety doesn’t require extra work.

Check your oven calibration

An oven thermometer prevents over-browning. Egg proteins tighten above 180 °F; you want gentle heat for custardy middles.

Season just before baking

Salt draws moisture out of vegetables; mixing it early can make the batter watery. Whisk it in right before portioning for the fluffiest texture.

Variations to Try

Tex-Mex: swap cheddar for pepper jack, add ½ cup corn kernels and 1 tablespoon minced pickled jalapeños; serve with salsa.
Mediterranean: use feta, fold in ¼ cup chopped sun-dried tomatoes and 1 tablespoon minced fresh oregano.
Smoky bacon: crisp 4 slices turkey bacon, crumble, and stir into batter along with ¼ teaspoon smoked paprika.
Gluten-free cheesy biscuit base: spoon 1 teaspoon almond flour mixed with 1 tablespoon shredded cheese into each cup before adding egg mixture for a crunchy bottom crust.