Making Turkey Sausage and Egg Muffins is straightforward and can be done in a few simple steps. Follow this guide to prepare your healthy breakfast muffins:

1. Preheat your oven to 350°F (175°C). Prepare a muffin tin by spraying it with non-stick cooking spray or lining it with muffin liners.
2. Cook the turkey sausage in a skillet over medium heat until browned and cooked through. Break it into smaller pieces as it cooks. Once done, remove from heat and set aside.
3. In a large bowl, whisk together the eggs until they are fully beaten. Season with salt and pepper to your preference.
4. Add the diced bell peppers, chopped spinach, diced onions, cherry tomatoes, and cooked turkey sausage to the bowl with the eggs. Stir until all ingredients are well combined.
5. If using cheese, fold in the shredded cheddar cheese into the mixture.
6. Divide the mixture evenly among the prepared muffin cups, filling each about three-quarters full.
7. Bake in the preheated oven for 20-25 minutes, or until the egg muffins are set and lightly golden on top.
8. Remove from the oven and let them cool in the muffin tin for a few minutes before transferring to a wire rack to cool completely.
9. Serve warm or store in an airtight container in the refrigerator for up to 5 days. You can also freeze them for up to a month.