Preheat the oven to 350°F (175°C). Prepare a standard 12-cup muffin tray by coating with nonstick spray or fitting each well with a paper liner.
In a sizable mixing bowl, whisk together the eggs, milk, and maple syrup until the mixture is fully blended and smooth.
Add the pancake mix to the bowl and stir gently until all the dry ingredients are just moistened. Take care not to overwork the batter.
Fold in the crumbled sausage and, if using, the shredded cheddar cheese, distributing them evenly throughout the mixture.
Spoon the batter into the prepared muffin cups, filling each cavity approximately three-quarters full to allow room for rising.
Place the tray in the oven and bake for 15 to 18 minutes, or until a toothpick inserted into the center of a muffin comes out clean and the tops are a light golden brown.
Allow the muffins to rest in the pan for a few minutes, then remove them and serve warm. If desired, drizzle with extra maple syrup just before serving.