Step 1

Preheat oven to 350 F degrees. Grease a 9 x 5-inch loaf pan with non-stick cooking spray.

Step 2

In a large bowl or electric mixer fitted with the paddle attachment, beat the butter and sugar until light and fluffy, about 2 minutes. Beat in eggs one at a time, incorporating well after each addition. Scrape down sides of bowl as necessary.

Step 3

In a medium bowl, whisk together the flour, baking soda, cardamom, cinnamon, ginger, allspice, and salt. Add to the butter mixture and beat gently until just combined. Add bananas, sour cream and vanilla and mix on low speed until just combined. Gently stir in nuts if using.

Step 4

Pour batter into prepared loaf pan and bake until deep golden brown and cake tester inserted into center comes out clean, 60-70 minutes. Let rest in pan for about 10 minutes, then turn out onto rack to cool completely. This bread is best enjoyed warm out of the oven or toasted.

Step 5

Freezer-Friendly Instructions: The bread can be frozen for up to 3 months. After it is completely cooled, wrap it securely in aluminum foil, freezer wrap or place in a freezer bag. Thaw overnight in the refrigerator before serving.