Preheat. Preheat the oven to 350°F and line a muffin pan with paper liners.
Mix dry ingredients. In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking soda, cinnamon, ginger, nutmeg, and salt.
Mix wet ingredients. In a separate bowl, whisk together the egg, vegetable oil, and vanilla extract.
Combine batter. Add the wet ingredients to the dry ingredients and stir just until combined. The batter will be very thick.
Add pears. Gently fold in the chopped pears until evenly distributed. The batter will loosen as the pears release moisture.
Bake. Divide the batter evenly between the muffin cups and bake for 20 to 25 minutes, or until a toothpick inserted into the center comes out clean.
Cool. Let the muffins cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.
Notes
Batter texture. The thick batter is intentional to balance the moisture released by the pears during baking.
Baking variation. Pears vary in juiciness, so some muffins may finish sooner than others. Remove when most test clean and allow them to finish setting as they cool.
Storage. Store muffins in an airtight container in the refrigerator for up to 3 days.