Got Leftover Buttermilk Freeze It Banana Bread Bliss

Ingredients

• 2 cups (250g) all-purpose flour, plus more for dusting the pan
• 1 teaspoon (5g) baking soda
• 1/2 teaspoon (2.5g) baking powder
• 1/2 teaspoon (3g) ground cinnamon
• 1/4 teaspoon (1.5g) salt
• 1 cup (200g) granulated sugar
• 1/2 cup (115g) unsalted butter, softened
• 2 large eggs
• 1 teaspoon (5ml) vanilla extract
• 1 cup (240ml) buttermilk, leftover, frozen & thawed recommended for ultimate flavour
• 3 very ripe bananas, mashed (about 1 1/2 cups)
• 1/2 cup (75g) chopped walnuts or pecans (optional)