Banana Macadamia Nut Muffins

Ingredients

• 1 ½ cups all-purpose flour
• ½ tsp ground cinnamon
• 1 tsp baking powder
• 1 tsp baking soda
• ¼ tsp salt (or no salt if using salted butter)
• ⅔ cup brown sugar
• 3 ripe bananas, mashed
• 1 large egg, beaten
• 1 tsp vanilla
• ½ cup melted butter
• ½ cup macadamia nuts, chopped
• ⅓ cup brown sugar
• 3 tbsp flour
• 3 tbsp cold butter, cubed
• 2 tbsp rolled oats
• ⅓ cup macadamia nuts, finely chopped