Brown the butter

• Melt the butter in a saucepan over medium heat.
• Cook until golden brown and nutty, then let cool slightly.

Preheat and prepare the pan

• Preheat the oven to 175 °C.
• Grease and line the loaf pan.

Mix the wet ingredients

• Whisk the brown sugar and granulated sugar into the browned butter.
• Beat in the eggs one at a time.
• Stir in the mashed bananas and vanilla extract.

Add the dry ingredients

• Whisk the flour, baking soda, salt and cinnamon together.
• Fold the dry mixture into the wet mixture until just combined.

Swirl in the sugar cookie spread

• Pour half the batter into the loaf pan.
• Add dollops of sugar cookie spread and swirl with a spatula.
• Top with the remaining batter and swirl again.

Bake

• Scatter the sprinkles over the top.
• Bake until a skewer inserted in the center comes out clean.

Cool and slice

• Let the banana bread cool in the pan for a few minutes.
• Turn out onto a rack and cool before slicing.