Preheat the oven to 350 and spray a muffin pan with non-stick cooking spray.
In a large bowl add crumbled cooked sausage, shredded cheese, baking powder, salt, pepper, and oat flour.
In a separate bowl, whisk together eggs, milk, and oil.
Add wet ingredients into the dry ingredients. Using a spatula, fold mixture together.
Spoon mixture into muffin pan filling each muffin about 3/4 full.
Bake for 25-30 minutes. Use a wooden skewer as a way to test to see if muffin is fully cooked.