Preheat your oven to 400ºF and line a 12-muffin tin with muffin liners.
Mix the flour, baking powder, and salt together in a large bowl before folding in 1 ½ cup (6 oz) of the shredded cheddar.
In a separate bowl, mix the milk, egg, and apple sauce together.
Once the breakfast sausage crumbles are cooked and slightly cooled, fold into the dry ingredients. Add the wet ingredients to the dry and mix everything together.
Spoon the mixture into the muffin tin, adding about 3.5 oz or 100g to each liner. Top with the remaining ½ cup (2 oz) of cheddar.
Bake for 22-25 minutes until the tops are golden brown and a toothpick comes out clean. Cool for 5 minutes before transferring out of the muffin tin to a wire rack.
I like to serve by slicing the muffins in half, adding a tiny pat of butter, and a drizzle of maple syrup.