Put your onion and bell pepper in a skillet with your choice of fat, I used red palm oil. Cook over medium heat until mostly cooked. About 5 minutes.
Add the mushrooms and cook for about 4 more minutes. Stir so the veggies don’t burn.
While your veggie mix is cooking spray your muffin tins with nonstick spray. Line each muffin tin with a slice of meat and a sprinkle of cheese.
Beat eggs with seasoning. Add cooked veggies to the egg mixture and stir to combine.
Carefully spoon egg and veggie mix into meat and cheese cups. Divide evenly between each muffin section.
Bake at 350 degrees for around 15-20 minutes, or until cooked through.
Carefully remove with a knife or fork.