In a medium bowl combine muffin mix and the first 1/4 cup wheat germ. In another bowl combine the egg, 1/2 cup apple butter, milk, and pumpkin or apple pie spice. Add the egg mixture all at once to the wheat germ mixture, stirring just till combined. Pour the batter into a greased 8x8x2-inch baking pan.
For topping, in a small bowl stir together brown sugar, the remaining 1/4 cup wheat germ, and 1/4 cup apple butter. Spoon mixture in small mounds atop batter in pan. Using a knife, marble the mixture through the batter. Bake in a 350 degree F oven for 25 to 30 minutes or till a wooden toothpick inserted near center comes out clean.
To serve, sift powdered sugar over each serving and serve with additional apple butter, if desired. Serve warm.