Step 1: Preheat the Oven - Begin by preheating your oven to 350°F (175°C).
Step 2: Sauté the Vegetables - In a skillet over medium heat, add avocado oil. Once heated, add the onion, red bell pepper, and garlic. Sauté for about 5 minutes.
Step 3: Add the Sausage - Add the chopped sausage to the skillet, stir, and cook for an additional 3-4 minutes.
Step 4: Incorporate the Spinach - Add the spinach and cook for another 2 minutes, then remove from heat.
Step 5: Beat the Eggs - In a mixing bowl, whisk the eggs and add the sea salt.
Step 6: Combine Ingredients - Add the sausage mixture to the eggs and mix thoroughly.
Step 7: Prepare the Muffin Tin - Grease a muffin tin with cooking spray or oil.
Step 8: Fill the Muffin Cups - Pour the egg mixture into the muffin cups, filling each about three-quarters full.
Step 9: Bake - Bake for 20-25 minutes until set and slightly golden on top.
Step 10: Cool and Serve - Allow to cool before transferring to a wire rack.