Peanut Butter Cheesecake with Caramelized Banana Topping

Cool crust on rack.

Maintain oven temperature.

Beat cream cheese and peanut butter in large bowl until blended and creamy, about 3 minutes.

Add both sugars and beat until fluffy, about 3 minutes.

Beat in vanilla, then eggs 1 at a time, then sour cream.

Scrape cheesecake batter into crust.

Stack 3 large pieces of foil on work surface and place springform pan in center.

Fold foil snugly up sides of pan.

Place springform pan in roasting pan.

Add enough water to roasting pan to come 1 inch up sides of springform pan.

Bake cheesecake in water bath until sides are puffed and center is set and edges are beginning to brown, about 1 hour 25 minutes.

Place hot cheesecake directly in refrigerator; chill uncovered until cold, at least 6 hours and up to 1 day.

Whisk diced butter and sugar in heavy large skillet over mediumlow heat until butter melts, sugar dissolves, and smooth caramel sauce bubbles thickly, about 4 minutes.

Slice bananas into 1/2-inch-thick, 2-inch-long diagonal slices, discarding ends.

Working in batches if necessary, add banana slices to skillet in single layer and cook over medium heat until heated through and coated, turning once, 1 to 2 minutes per batch.

Using forks, carefully transfer banana slices to top of cheesecake, arranging in concentric overlapping circles.

Let cheesecake stand at room temperature up to 1 hour before slicing and serving.