Step 1

Preheat oven to 375°. Prepare banana bread batter according to package directions; stir in walnuts.

Step 2

In a 10-in. ovenproof skillet, melt butter over medium heat; stir in brown sugar until dissolved. Add lemon juice; cook and stir until slightly thickened, 2-3 minutes longer. Remove from heat. Arrange bananas in a single layer over brown sugar mixture; sprinkle with coconut.

Step 3

Spoon prepared batter over coconut. Bake until dark golden and a toothpick inserted in center comes out clean, 35-40 minutes. Cool 5 minutes before inverting onto a serving plate. Serve warm.