Add the yogurt, milk, egg, applesauce, and butter to a medium bowl. Whisk to combine into a smooth mixture.
Add the flour, sugar, baking powder, and salt. Whisk gently to combine.
Add desired add-ins if using.
Heat a large nonstick skillet over medium heat. Melt a little butter and swirl to coat the pan.
Spoon out about ¼ cup batter per pancake for regular-size pancakes or 2 tablespoons batter for mini pancakes. Cook for 3-4 minutes, or until you see bubbles start to form on the surface and the edges are set.
Flip over with a spatula and cook for an additional 3 minutes. Serve or place into a 200-degree-F oven on a baking sheet while you finish making the rest of the batch. Add a little more butter as needed to keep the pancakes from sticking.
Serve!
