Blueberry Streusel Muffins – Garden & Gun

Ingredients

• 2 cups all-purpose flour, divided
• 1½ cups fresh blueberries
• 1 tbsp. baking powder
• 1 cup whole milk
• ¼ cup vegetable oil
• ⅓ cup granulated sugar
• 3 tbsp. Duke’s mayonnaise
• 2 tsp. grated lemon zest
• 1 large egg
• 1 tsp. vanilla extract
• ½ cup all-purpose flour
• ½ cup chopped pecans
• ⅓ cup firmly packed brown sugar
• ½ tsp. ground cinnamon
• ¼ cup salted butter, melted