Unsalted butter, softened, for greasing
3 cups mashed ripe bananas
1 ½ cups packed light brown sugar
1 cup granulated sugar
1 cup unsalted butter (8 ounces), melted and browned
4 large eggs
2 cups semisweet chocolate chips
4 ½ cups all-purpose flour (about 19⅛ ounces), plus more for dusting
2 ¾ teaspoons baking soda
2 ¼ teaspoons ground nutmeg
2 teaspoons kosher salt
Cooking spray
Coffee ice cream, for serving
Banana-Caramel Sauce, for serving
Preheat oven to 325°F. Grease 2 (9-x 5-inch) loaf pans with softened butter, dust with flour, and line bottom of each pan with a strip of parchment paper. Whisk together bananas, brown sugar, granulated sugar, brown butter, and eggs; stir in chocolate chips. Whisk together flour, baking soda, nutmeg, and salt in a separate bowl, and fold into banana mixture until just combined.
Pour batter into prepared pans. Bake in preheated oven until set, 1 hour and 30 minutes to 1 hour and 40 minutes, tenting with aluminum foil after 1 hour. Let loaves cool in pans 10 minutes; transfer to refrigerator to let cool completely, about 4 hours. Once cool, remove loaves from pans, and cut into 1-inch-thick slices.
Preheat oven to broil with rack 6 inches from heat source. Place slices in a single layer on a sheet pan coated with cooking spray, and broil until a golden crust develops, about 4 minutes. Transfer slices to plates; top with coffee ice cream and banana-caramel sauce.
