01 - Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - Melt 1 tablespoon butter in a skillet over medium heat. Add diced apples, brown sugar, and ground cinnamon. Sauté for 4–5 minutes, stirring occasionally, until apples are lightly caramelized and tender. Remove from heat and allow to cool slightly.
03 - In a large mixing bowl, whisk together all-purpose flour, granulated sugar, baking powder, baking soda, salt, and ground cinnamon until evenly incorporated.
04 - In a separate bowl, whisk eggs, melted butter, milk, and vanilla extract until fully combined.
05 - Add wet mixture to the dry ingredients and stir gently until just combined; avoid overmixing.
06 - Carefully fold in the cooled, caramelized apples along with any juices into the batter.
07 - Divide batter evenly into prepared muffin cups, filling each about three-quarters full.
08 - Bake at 350°F (175°C) for 22–25 minutes, or until a toothpick inserted in the center emerges clean. Allow to cool in the pan for 5 minutes, then transfer to a wire rack.
09 - In a microwave-safe bowl, combine caramel candies and heavy cream. Microwave in 20-second intervals, stirring between each, until smooth and melted (about 1–1.5 minutes).
10 - Drizzle warmed caramel over the cooled muffin cups before serving.