pear and hazelnut muffins

Ingredients

• 2 small-medium firm pears
• 6 tablespoons (85 grams) unsalted butter, melted and cooled slightly (plus more for cups)
• 2/3 cup (125 grams) natural cane sugar, such as Turbinado, light brown or granulated sugar
• 1 cup (240 ml) buttermilk
• 2 large eggs, lightly beaten
• 1 to 1 1/2 teaspoons vanilla extract
• 3/4 cup (75 grams) rolled oats
• 1 cup (125 grams) all-purpose flour
• 1/2 cup (60 grams) whole wheat flour
• 3/4 teaspoon baking soda
• 2 teaspoons baking powder
• 1/2 teaspoon ground cardamom, which I replaced with 1/4 teaspoon cinnamon
• 1/2 teaspoon ground nutmeg, which I replaced with 1/4 teaspoon freshly grated
• 3/4 teaspoon kosher salt
• 1 cup (120 grams) toasted hazelnuts, coarsely chopped
• 1/2 cup (85 grams) bittersweet chocolate chunks (optional)