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1
Preheat oven to 325 degrees F (165 degrees C). Grease two 7x3-inch loaf pans.
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2
In a bowl, whisk together 2 3/4 cups of flour, 2 teaspoons of cinnamon, the baking soda, and salt until thoroughly combined. In a separate mixing bowl, beat the melted butter with 2 cups of sugar until smooth, and mix in the eggs, one at a time, followed by the Greek yogurt and vanilla extract. Stir in the flour mixture just until incorporated.
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3
Fold in the bananas, apples, and chopped walnuts until combined; do not overmix. There should be small chunks of banana visible in the batter. Pour half the batter into each prepared loaf pan.
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4
Mix the brown sugar, 1/2 cup of white sugar, 1 tablespoon of cinnamon, 1/4 cup of flour, and 3 tablespoons of softened butter together in a bowl until the mixture resembles coarse crumbs. Sprinkle half the crumb topping over each loaf. Garnish each loaf with banana and apple slices.
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5
Bake in the preheated oven for 30 minutes, then remove and cover each pan with aluminum foil. Return to oven, and bake an additional 15 or 20 minutes, or until a toothpick inserted into the center of the loaves comes out clean. Allow to cool before serving.
