Preheat oven to 350 degrees F. Spray a jumbo muffin pan* with cooking spray.
In a large mixing bowl, microwave butter until melted (about 20 seconds). Add brown sugar, eggs, and milk and mix until well combined.
Add flour, baking powder, salt, and cinnamon to bowl. Gently, mix everything together until you can no longer see streaks of flour.
To the bowl, add pears and 1/4 cup of granola. Mix until just combined.
Fill muffin cavities 2/3rds of the way full. Sprinkle the remaining 1/2 cup of granola on the top of the muffins.
Bake muffins for 25-28 minutes. Muffins will be done when a toothpick inserted in the middle of the muffin comes out with just a few crumbs sticking to the toothpick. Allow to cool for 5 minutes before serving.