Preheat the Oven - Heat your oven to 350°F (180°C). Line a 9 × 5 in (23 × 13 cm) loaf pan with parchment paper or grease and flour it.
Mash Bananas and Pumpkin - In a small bowl, mash the overripe bananas with a fork, then stir in the pumpkin puree until smooth. Very brown bananas give the sweetest flavor and softest texture. Set aside.
¾ cup bananas, ¾ cup pumpkin puree
Cream Butter and Sugar - In a medium mixing bowl, beat the softened butter and sugar together with a hand mixer until light and blended. (If the butter isn’t soft, microwave at half power for 20 seconds.)
½ cup butter, 1 cup sugar
Add Wet Ingredients - To the butter mixture, add the mashed banana-pumpkin blend, milk, vanilla, and room-temperature eggs. Beat with a hand mixer until fully combined.
½ whole milk, 1 teaspoon vanilla, 2 large eggs
Mix Dry Ingredients - In a separate bowl, whisk together the flour, baking soda, salt, cinnamon, nutmeg, chia seeds, hemp seeds, and pumpkin seeds. This step ensures the leavening and spices are evenly distributed.
2 cups unbleached all purpose flour, 1 teaspoon baking soda, ½ teaspoon salt, 1 teaspoon cinnamon, ½ teaspoon nutmeg, 2 tablespoons chia seeds, ¼ cup hemp seeds, ¼ cup pumpkin seeds
Combine Batter - Add the dry ingredients to the wet mixture. Blend with a hand mixer on low speed just until combined, scraping down the sides as needed.
Bake - Pour the batter evenly into the prepared loaf pan. Bake for 60–65 minutes, or until a toothpick inserted into the center comes out clean or with only a few crumbs.
Cool and Glaze - Allow the loaf to cool for at least 20 minutes. In a small bowl, stir together the powdered sugar and maple syrup until smooth. Pour the glaze over the cooled loaf, spreading gently with the back of a spoon. Garnish with whole raw pumpkin seeds if desired.
¾ cup powdered sugar, ¼ cup maple syrup