Follow these simple steps to create your Firecracker Bundt Cake:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a Bundt pan to prevent sticking.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and cayenne pepper. Set aside.
3. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and granulated sugar until light and fluffy, about 4-5 minutes.
4. Add Eggs: Add eggs one at a time, mixing well after each addition. Ensure everything is well blended.
5. Incorporate Buttermilk and Vanilla: Gradually add the buttermilk and vanilla extract to the butter mixture. Mix until smooth.
6. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients. Mix just until combined; be careful not to overmix.
7. Add Sprinkles: Gently fold in the colorful sprinkles, ensuring they are evenly distributed throughout the batter.
8. Pour Batter: Pour the batter into the prepared Bundt pan. Use a spatula to smooth the top evenly.
9. Bake: Place the Bundt pan in the preheated oven and bake for 45-50 minutes, or until a toothpick inserted in the center comes out clean.
10. Cool the Cake: Remove from the oven and allow the cake to cool in the pan for about 15-20 minutes. Then, carefully invert it onto a wire rack and cool completely.
11. Decorate: Once the cake is completely cooled, drizzle or spread the rainbow-colored frosting over the top. Add extra sprinkles for the perfect finish.