Preheat the oven to 425 F (218 C) for at least 30 minutes before baking. Line (2) 12 ct. muffin pans with cupcake liners.
If you would like to top the pear muffins with the spiced crumble topping, mix the flour, light brown sugar, sugar and cinnamon together until well combined. Pour the melted butter into the mixture, mixing together with a fork until the butter is thoroughly mixed through.
½ cup (60 g) all purpose flour, ¼ cup (50 g) light brown sugar, 2 tablespoons (25 g) granulated sugar, ½ teaspoon ground cinnamon , 3 - 4 tablespoons (45 - 60 ml) melted butter
In another mixing bowl, whisk the flour, baking powder, baking soda, cinnamon and salt together until well combined. Set aside for now.
2 cups (240 g) all purpose flour, 2 teaspoons baking powder, ½ teaspoon baking soda, 1 teaspoon ground cinnamon , ½ teaspoon salt
Add the butter, sugar and light brown sugar into the bowl of a stand mixer fitted with paddle attachment or in a mixing bowl to use with a handheld mixer. Cream the butter and sugars together on medium speed for about 3 - 4 minutes or until the mixture is light and well combined.
½ cup (113 g) unsalted butter, room temperature, ½ cup (100 g) granulated sugar, ½ cup (100 g) light brown sugar
Cream in the eggs, vanilla extract and sour cream until smooth and well combined. On low, mix the dry ingredients into the wet alternating with the milk in this order : dry, milk, dry milk, dry. When about ¾ of the dry ingredients have been mixed into the wet, toss the pears into the muffin batter. Gently fold the pears into the muffin batter until just combined.
2 large eggs, room temperature, 2 teaspoons (10 ml) vanilla extract , ½ cup (120 g) sour cream, room temperature, ¼ cup (60 ml) milk, room temperature, 1½ cups diced pears
For more bakery style muffins, alternate filled and unfilled muffin wells. Use a 3 tablespoon sized cookie scoop to scoop the pear muffin batter into each of the muffin liners, alternating every other cup. Top the muffins with the crumble topping. Gently press the topping into the batter. Bake the muffins at 425 F (218 C) for 5 minutes. Then reduce the temperature to 375 F (190 C) for an additional 10 - 14 minutes (for a total of 15 - 19 minutes). Make sure NOT to open the oven door, simply reduce the oven temperature while the muffins continue to bake. The muffins are done when a toothpick inserted into the center comes about with a few moist crumbs. Cool the pear muffins in the muffin pan for 5 - 10 minutes. Carefully remove the muffins to cool to room temperature and enjoy.