Whisk together first 3 ingredients until blended.

Remove and reserve streusel packet from muffin mix package. Stir together contents of muffin mix packet and cinnamon in a large bowl. Make a well in center of mixture. Add egg mixture, pineapple, and next 4 ingredients, stirring just until moistened.

Place baking cups in muffin pans. Spray with cooking spray. Spoon batter into cups, filling two-thirds full. Sprinkle evenly with reserved streusel packet.

Bake at 425° for 18 to 23 minutes or until golden. Cool in pans on wire racks 5 minutes. Remove from pans, and cool on wire racks.

Stir together powdered sugar, lemon rind, and lemon juice until smooth, and drizzle over tops of muffins, if desired.

Note: For testing purposes only, we used Betty Crocker Cinnabon Cinnamon Streusel Premium Muffin Mix.