Zucchini Coffee Cake Muffins

Ingredients

• 1 ½ cups all-purpose flour
• 1 cup granulated sugar
• 1 tsp baking powder
• ½ tsp baking soda
• ½ tsp ground cinnamon
• ¼ tsp salt
• 1 ½ cups grated zucchini
• 1 large egg
• ⅓ cup vegetable oil
• 1 tsp vanilla extract
• ¼ cup brown sugar, packed
• 2 tbsp all-purpose flour
• 1 tsp ground cinnamon
• 2 tbsp unsalted butter, softened