01 - Preheat oven to 350°F. Grease a standard 9x5-inch loaf pan and line with parchment paper, ensuring an overhang for easy removal.
02 - In a large mixing bowl, whisk together all-purpose flour, baking powder, baking soda, salt, granulated sugar, and ground cinnamon until thoroughly blended.
03 - In a separate bowl, whisk together melted butter, cold buttermilk, and large egg until fully incorporated.
04 - Pour wet ingredients into dry mixture, stirring gently until just combined. Avoid overmixing to ensure tenderness.
05 - Gently fold in shredded sharp cheddar cheese and finely crushed Flamin Hot Cheetos until evenly dispersed throughout the batter.
06 - Combine granulated sugar and ground cinnamon in a small bowl for the topping mixture.
07 - Scoop generous spoonfuls of the batter into the prepared loaf pan, sprinkling half the cinnamon sugar topping midway. Add remaining batter to finish layering.
08 - Drizzle melted butter over the surface and sprinkle with the remaining cinnamon sugar blend.
09 - Bake for 32 to 38 minutes or until a toothpick inserted in the center emerges clean.
10 - Let loaf cool in pan for 10 minutes, then lift out using the parchment overhang and transfer to a wire rack to fully cool before slicing.