Preheat oven to 350°F (180°C). Spray a 9-inch round cake pan with baking spray with flour.
In the bowl of a stand mixer fitted with the paddle attachment, beat butter and sugar at medium speed until fluffy, 3 to 4 minutes, stopping to scrape sides of bowl. Add eggs, one at a time, beating well after each addition. Beat in banana, sour cream, and vanilla.
In a medium bowl, whisk together flour, baking powder, and salt. Reduce mixer speed to low. Gradually add flour mixture to banana mixture, beating just until combined. Spread half of batter into prepared pan. Drizzle with ¾ cup (246 grams) warm Caramel, and sprinkle with pecans. Top with remaining batter, and swirl in ¼ cup (82 grams) Caramel. Sprinkle with Brown Sugar Cinnamon Topping.
Bake for 50 minutes. Let cool in pan for 10 minutes. Remove from pan, and let cool completely on a wire rack. Drizzle with remaining Caramel before serving, if desired.
Recipe by Bake from Scratch at https://staging.bakefromscratch.com/caramel-pecan-banana-coffee-cake/