Oat Muffins with Pecan Streusel Topping - Once Upon a Chef

Ingredients

• ½ cup old-fashioned rolled oats
• ⅓ cup all purpose flour, spooned into measuring cup and leveled-off
• ⅓ cup packed light brown sugar
• ⅓ cup finely chopped pecans
• 1¼ teaspoons ground cinnamon
• ⅛ teaspoon salt
• 4 tablespoons unsalted butter, melted
• 8 tablespoons (1 stick) unsalted butter, divided
• 1½ cups old-fashioned rolled oats
• 2¼ cups all-purpose flour, spooned into measuring cup and leveled-off
• 1¼ teaspoons salt
• 1 teaspoon cinnamon
• 1½ teaspoons baking powder
• ¼ teaspoon baking soda
• 1⅓ cups packed light brown sugar
• 1¾ cups milk
• 2 large eggs