Step 1: In a large bowl, combine the all-purpose flour, granulated sugar, baking powder, ground cinnamon, and salt. Whisk until well combined, ensuring no lumps.
Step 2: In a separate medium bowl, whisk together the softened butter, eggs, milk, vanilla extract, sweet potato puree, and bourbon caramel sauce until smooth and fully incorporated.
Step 3: Gradually add the wet ingredients to the dry ingredients, mixing with a spatula or spoon until just combined. Be careful not to overmix the batter.
Step 4: Pour the batter evenly into a greased baking dish (an 8x8 inch or 9x9 inch pan works well).
Step 5: Bake in a preheated oven at 350°F (175°C) for 30-35 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Step 6: Remove the cake from the oven and let it cool slightly in the dish on a wire rack.
Step 7: Garnish the warm cake generously with chopped nuts, granola, fresh berries, and an additional caramel drizzle, if desired. Serve immediately and enjoy your decadent Sweet Potato & Bourbon Caramel Cake!