This recipe crafts moist and flavorful banana muffins elevated with rum-infused raisins and a delectable crispy crumb topping. Combining ripe bananas with warming spices and a rich streusel, these muffins offer a comforting and indulgent treat, perfect for breakfast or an afternoon snack. The optional extra banana deepens the fruit's presence.
For optimal flavor and moisture, use very ripe bananas (skins mottled with brown spots). Mash them thoroughly for a smooth batter. Ensure your raisins are fully plumped by soaking them in warm rum for at least 30 minutes, or even overnight. When combining wet and dry ingredients, mix just until combined to prevent tough muffins; a few lumps are fine. The crispy crumb topping adds a delightful texture contrast; ensure butter is soft for easy mixing. For an extra aromatic touch, toast the walnuts lightly before adding them.