Step 1

Preheat the oven to 350 degrees F (175 degrees C). Spray a 12-cup muffin tin with nonstick cooking spray.

Step 2

Place a thin layer of potato slices in the bottom of each muffin cup. Add a little butter on top.

Step 3

Bake in the preheated oven for 5 minutes.

Step 4

Mix eggs, tomato, bell pepper, spinach, ham, and onion together in a large bowl. Remove muffin tin from oven and ladle the egg mixture over the potatoes. Top each muffin cup with a mozzarella cube.

Step 5

Continue baking until egg bites are set, about 20 minutes.