Preheat oven to 350 degrees F (175 degrees C). Grease a 8 1/2×4 1/2-inch loaf pan.
Combine flour, sugar, baking powder, salt, and baking soda in a bowl. Stir butter into flour mixture until combined. Add orange juice, orange zest, and egg; mix well. Fold in cranberries and walnuts. Spoon batter into the prepared pan.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 60 to 75 minutes. Cool in the pan for 10 minutes before removing to cool completely on a wire rack.
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