PREHEAT oven to 350º F. Grease or paper-line 24 muffin cups.
COMBINE flour, sugar, pumpkin pie spice, baking soda and salt in large bowl. Combine pumpkin, eggs and oil in medium bowl; mix well. Stir into flour mixture just until moistened. Stir in apples. Spoon batter into prepared muffin cups, filling three-fourths full.
FOR STREUSEL TOPPING:
COMBINE sugar, flour and cinnamon in medium bowl. Cut in butter with pastry blender or two knives until mixture is crumbly. Sprinkle over muffin batter.
BAKE for 30 to 35 minutes or until wooden pick inserted in center comes out clean. Cool in pans for 5 minutes; remove to wire racks to cool slightly.