Pre-heat your oven to 400 degrees. Prepare muffin tins with non-stick cooking spray or line them with paper liners.
Cook breakfast sausage until no longer pink; drain.
In a small bowl combine milk with vinegar and allow it to sit for 5 minutes.
In a large bowl sift together flour, sugar, baking powder, baking soda and salt.
Add in eggs, milk, melted butter and vanilla; stir to combine.
Stir in cooked breakfast sausage.
Fill each muffin cup 2/3 of the way full.
Bake for about 15-16 minutes, or until done.
Drizzle the muffins with maple syrup and serve immediately.