Preheat Oven: Preheat your oven to 375°F (190°C). Line a muffin tin with paper liners or lightly grease it.
Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, salt, and sugar.
Combine Wet Ingredients: In another bowl, whisk together the milk, eggs, melted butter, and maple syrup.
Combine Both Mixtures: Slowly pour the wet ingredients into the dry ingredients. Stir until just combined; avoid overmixing.
Add Sausage: Fold in the cooked and crumbled sausage.
Fill Muffin Cups: Divide the batter evenly among the muffin cups, filling each about ¾ full.
Bake: Bake for 15-18 minutes or until the tops are golden brown and a toothpick inserted into the center comes out clean.
Cool and Serve: Allow the muffins to cool slightly before serving. For added sweetness, drizzle with maple syrup.