Apple Pecan Muffins

Preheat oven to 375 degrees.  In a large bowl, sift together 1 1/2 cups flour, baking powder, baking soda, salt and 2 teaspoons apple pie spice.

In a medium bowl, whisk together eggs, yogurt and 4 tbsp melted butter.  Add 1 cup brown sugar and whisk to combine.  Add to the dry ingredients and mix until just combined.  Fold in apples and 1/2 cup pecans.

Divide the batter among a greased 12-cup muffin tin, filling each about 2/3 full.

In a small bowl, combine remaining flour, apple pie spice, butter, brown sugar, and pecans.  Sprinkle about 1 tablespoon of the crumb mixture over the top of each muffin.  Bake until inserted toothpick comes out clean, about 25 minutes.