Preheat your oven to 375°F (190°C). This step is crucial, as a hot oven will bake the muffins to perfection.

Grease a 12-cup muffin tin with cooking spray or olive oil, ensuring that each cup is nicely coated so the muffins don’t stick.

In a large bowl, whisk the eggs until they are well beaten. This is your base, and it needs to be nice and fluffy!

Stir in the diced ham, shredded cheddar cheese, diced bell peppers, red onion, and chopped spinach into the beaten eggs. This colorful mix adds not only taste but also a lovely presentation!

Season the mixture with salt and pepper to your liking. Give everything a good mix to ensure that the ingredients are well combined.

Pour the egg mixture evenly into the prepared muffin cups, filling each about 2/3 full. This gives them room to rise as they bake.

Bake in your preheated oven for approximately 18-20 minutes or until the tops are set and lightly golden.

To check doneness, insert a toothpick into the center of a muffin. If it comes out clean, your muffins are ready!

Allow the muffins to cool in the tin for a few minutes before transferring them to a wire rack to cool completely.