Pumpkin Pecan Streusel Muffins

Ingredients

• 1 tablespoon baking powder
• ¾ cups light firmly brown sugar
• 1.5 cups canned pumpkin
• 1 large egg
• 1.5 cups flour
• 2 tablespoons light brown sugar
• ¾ cups milk
• ½ cups pecans
• 1.75 teaspoons pumpkin pie spice
• 1 cup quick-cooking oats
• 2 tablespoons unsalted butter
• ¼ cups vegetable oil