FOR THE CRUMB TOPPING: – 3/4 cup (95 grams) all-purpose flour (spooned & leveled) – 1/2 cup (100 grams) brown sugar – 1 teaspoon ground cinnamon – 6 tablespoons (85 grams) cold unsalted butter FOR THE CAKE: – 2 cups (250 grams) all-purpose flour (spooned & leveled) – 1 teaspoon baking powder – 1/2 teaspoon baking soda – 1/2 teaspoon ground cinnamon – 1/2 teaspoon salt – 1/2 cup (115 grams) unsalted butter , softened – 1/2 cup (100 grams) brown sugar – 1/4 cup (50 grams) granulated sugar – 2 large eggs , room temperature – 1 teaspoon vanilla extract – 1 and 1/2 cups mashed banana (4 medium ripe bananas or 3 large ripe bananas) – 1/2 cup (120 ml) buttermilk
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