Ingredients

• For the topping:
• 2 tablespoons (1 ounce) unsalted butter, at room temperature
• 1/3 cup firmly packed brown sugar
• 1/2 teaspoon ground cinnamon
• 1/3 cup coarsely chopped walnuts
• For the batter:
• 1 2/3 cup all-purpose flour
• 3/4 teaspoon baking soda
• 1/2 teaspoon salt
• 4 tablespoons (2 ounces) unsalted butter, at room temperature
• 1/2 cup granulated sugar
• 1/2 cup pure maple syrup
• 2 eggs
• 3 ripe bananas, mashed with a fork
• 1/2 cup coarsely chopped walnuts

Serves about 8