Banana Mocha Chocolate Chip Muffins

Ingredients

• 4-5 teaspoons instant coffee granules
• 5 teaspoons hot water
• 3/4 cup softened butter (unsalted)
• 1 and 1/4 cups granulated sugar
• 1/4 cup buttermilk (for 1 egg)
• 1 and 1/3 cup mashed banana
• 1 teaspoon vanilla extract
• 2 and 1/4 cups all-purpose flour
• 1 and 1/2 teaspoon baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 and 1/4 cup semi-sweet chocolate chips
• 1-2 tablespoons milk/water (optional)