Begin the pancakes by sifting together the flour, baking powder, salt and sugar into a large mixing bowl.
In a second bowl, beat together the egg, milk, and yogurt/sour cream. Then, stir this mixture into the flour mixture. Mix just until no flour streaks remain. Stir in the melted butter.
Heat a nonstick skillet or griddle and melt a teaspoon of butter. Depending on what size you want your pancakes, ladle the correct amount of batter onto the skillet. When bubbles appear, swirl a tablespoon of pumpkin butter into the batter of each pancake, and then flip your pancakes. Add more butter, as necessary.