Preheat oven to 375°F (190°C). Line 12 muffin cups with paper liners.
Streusel Topping: Stir together brown sugar and flour. Add butter and crumble with fingers or mix with fork until mixture is in pea-size pieces.
Whisk together flour, brown sugar, baking powder, salt, cinnamon and nutmeg.
Whisk together egg, apple juice and oil. Stir into flour mixture just until blended.
Stir in apples. Divide batter evenly among prepared cups. Sprinkle Streusel Topping over top.
Bake for 20 to 25 minutes or until golden and tester inserted into centre comes out clean.