Preheat oven to 400°.
Spray 9 or 10 regular-sized muffin tins or 18-20 miniature muffin tins with cooking spray; set aside.
Separate eggs with whites in one bowl and egg yolks in another bowl; set aside.
In a large mixing bowl, cream the butter and sugar with an electric mixer until smooth.
Add egg yolks and beat well.
In a medium mixing bowl, combine flour, baking powder and salt.
Add to butter mixture alternately with lemon juice.
(I used an electric mixer at low speed).
Beat egg whites in a medium mixing bowl until stiff peaks form.
This will take between 5-10 minutes.
Fold stiff egg whites into batter with lemon peel.
Spoon batter into greased muffin tins about two-thirds full.
Combine 2 tablespoons sugar with 1/4 tsp. cinnamon.
Sprinkle about 2/3 teaspoon cinnamon-sugar mixture evenly over top of muffins.
Bake at 400° about 17 minutes for regular sized muffins and about 7-9 minutes for miniature muffins, until a toothpick inserted in center comes out clean.
Cool muffins in tins about 10 minutes before removing to wire racks to cool completely.
Yield: 9-10 regular sized muffins or 18-20 miniature muffins.