Coffee Cake Banana Bread

Ingredients

• 4 tbsp. Butter, cut into small cubes
• 1/4 tsp. Ground cinnamon
• 1/4 tsp. Kosher salt
• 1/2 cup Brown sugar
• 1/2 cup All-purpose flour
• 3 Ripe bananas, mashed
• 1/2 tsp. Espresso powder
• 1 tsp. Pure vanilla extract
• 1/4 cup Sour cream
• 1 Large egg plus egg yolk
• 1/4 cup Brown sugar
• 3/4 cup Granulated sugar
• 1/2 cup Unsalted butter, melted
• 1/2 tsp. Kosher salt
• 1 tsp. Baking soda
• 2 cups All-purpose flour
• Cooking spray, for pan