Preheat oven to 400 degrees. Prepare muffin cups with a light coating of cooking spray.
Combine dry ingredients (flours, baking soda, baking powder, salt and cinnamon) together in a bowl.
Core and dice the pears into small chunks. Combine the pears, buttermilk, maple syrup, oil, sugar, egg and all but 2 tablespoons of the oatmeal together in a second bowl. Let sit for 5 minutes.
Combine the pecans and reserved oatmeal together to use as a topping for the muffins. Set aside.
Combine the wet and dry ingredients together until just mixed. Spoon batter into muffin cups, filling 2/3s full. Sprinkle with the pecan/oatmeal mix. Bake 18 to 20 minutes until a toothpick inserted in the middle comes out clean. Cool 5 minutes and remove from pan.
Serve warm or let the muffins finish cooling on a rack.