Preheat oven to 350 degrees. Spray 12 muffin tins well with nonstick cooking spray. Set aside. Place a medium skillet over medium heat. Spray with nonstick cooking spray and sauté veggies with salt and pepper until tender, about 4 minutes. Remove from heat and add 1 tablespoon into the bottom of each muffin tin.
Crack all eggs into a large liquid measuring cup. Add salt and pepper and whisk until well scrambled. Add 3-4 tablespoons to each muffin tin and do your best to divide evenly.
Add sausage and cheese to the top of each muffin. Bake 15-20 minutes or until egg is completely cooked.
Cool 3-5 minutes before removing from each muffin tin. Serve warm.