Use a vegetable peeler or a paring knife to peel the apple. Use an apple corer to remove the core, starting at the stem and pressing down through the center of the apple. If you don’t have an apple corer, carefully cut around the core with a knife. Place the peeled and cored apple on a cutting board. Slice it into ⅛-inch (3 mm) thick rings, ensuring even thickness for uniform cooking.
In a large mixing bowl, combine the flour, sugar, baking powder, salt, and cinnamon. Stir well to ensure all dry ingredients are evenly distributed.
In a separate bowl, lightly beat the eggs. Then, add the milk and the melted, cooled butter. Mix until the wet ingredients are fully combined.
Slowly pour the wet mixture into the dry ingredients. Stir together until just combined. It's okay if the batter has a few lumps—they will help create a tender pancake.
Gently fold the rough-chopped raisins into the batter.
Preheat a skillet over medium heat and lightly grease with cooking spray or vegetable oil, using a paper towel to wipe any excess grease. Alternatively, you can use a griddle, lightly greased, and heated to between 350°F (180℃) and 375°F (190℃).
Dip each apple ring into the pancake batter, ensuring they are fully coated. Use a fork or spoon to help transfer the batter-coated rings to a preheated skillet.
Place the batter-dipped apple rings onto the hot, lightly greased skillet or griddle. Cook for about 2-3 minutes on each side, or until bubbles form on the surface and the edges look set. Flip the pancakes and gently press the sides around the apple rings to ensure even cooking.
Once both sides are golden brown, remove the pancakes from the skillet. Serve warm with toasted, chopped pistachios, and maple or honey.