Preheat oven to 350°F and grease a muffin pan or use a silicone baking tray.

In a large bowl, add pancake mix and press the mix along the edges to form a well in the center. Add milk, eggs, maple syrup, and Greek yogurt to the well, then whisk together the wet ingredients.

Gently mix in the pancake mix until combined.

Divide the batter among 12 muffin cavities (about ¼ cup of batter in each). Top with mix-ins of choice and gently mix them in with the back of a spoon.

Bake for 25-30 minutes or until a toothpick inserted into the center of the muffins comes out clean. Allow to cool slightly before removing from the tray.