01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - Whisk flour, baking powder, baking soda, salt, and cinnamon together in a large mixing bowl until evenly distributed.
03 - In a separate bowl, beat the eggs thoroughly. Add vegetable oil, buttermilk, vanilla extract, granulated sugar, and brown sugar. Whisk until the mixture becomes smooth.
04 - Fold the wet mixture into the dry bowl, stirring just until the ingredients are combined. Avoid overmixing.
05 - Gently fold in the diced apples and chopped toasted pecans, ensuring even distribution throughout the batter.
06 - Fill each muffin cavity halfway with batter. Place a teaspoon of chopped caramel candies or a drizzle of caramel sauce into the center of each, then cover with the remaining batter.
07 - Bake for 20 to 22 minutes, or until a toothpick inserted into the center (avoiding caramel) emerges clean.
08 - Allow muffins to rest in the tin for 5 minutes before transferring to a wire rack to cool entirely.