Preheat oven to 375ºF. Grease muffin cups or line with muffin liners.
In a small saucepan over medium heat, saute the apples with maple syrup and cinnamon for about 5 minutes until softened and lightly caramelized. Set aside.
Stir together the whole wheat flour, oats, flax, cinnamon, salt, baking powder, and baking soda in a mixing bowl. Add in the maple syrup, applesauce, melted butter, vinegar, vanilla and milk. Stir until just moistened. Fold in chopped apple and raisins. Divide the batter between 12 muffin cups.
To make the streusel, mix together the flour, sugar, oats, salt, cinnamon and hemp hearts. Then work in the vegan butter to yield coarse crumbs. Sprinkle on top of the muffins.
Bake for about 18 minutes in the preheated oven, or until a toothpick comes out clean. Allow to cool before eating.