Preheat and prepare: Heat your oven to 375°F and lightly grease a standard 12-cup muffin pan with cooking spray or butter.
Layer the tater tots: Place 3 tater tots in each muffin cup, pressing them gently to create a compact, even base that covers the bottom and slightly up the sides.
Bake the base: Bake the tater tots for 10 minutes until they begin to crisp and hold together, then carefully remove the pan from the oven.
Whisk the eggs: In a large bowl, crack 10 eggs and whisk together with 1/4 cup milk, salt, and pepper until the mixture is smooth and slightly frothy.
Cook the meat and veggies: In a skillet over medium heat, brown 1 cup of breakfast sausage, breaking it into small crumbles as it cooks for about 5-7 minutes, then add diced bell pepper and cook for another 2-3 minutes until softened.
Combine fillings: Drain any excess grease from the meat and veggie mixture, then fold it into your whisked egg mixture along with the shredded cheese.
Fill the cups: Carefully pour the egg mixture into each muffin cup over the tater tots, filling them about three-quarters full to allow for rising.
Bake to perfection: Bake at 375°F for 18-20 minutes until the eggs are set in the center and the tops are lightly golden.
Cool slightly: Remove the pan from the oven and let the omelets cool for 3-5 minutes, then gently run a thin knife around the edges and pop them out of the pan.
Garnish and serve: Top with fresh herbs, additional cheese, or a dollop of sour cream if desired.