Preheat oven to 350F and spray a regular 12 hole muffin tin with some cooking spray.
In a bowl whisk your eggs and 1 Tbsp of sugar together, add in applesauce, yogurt, milk and lemon juice, stir well.
Mix in 1 cup of flour, baking powder and soda then stir in your lemon zest, fresh is best, right from the lemon peel.
Pour batter into your 12 muffin cups. In a small bowl melt your butter in the microwave, in a separate small bowl mix your 2 Tbsp of sugar and 2.5 Tbsp of flour together then pour in melted butter and mash with a fork till crumb forms. Sprinkle on top of muffins.
Bake in the oven for approx 18 minutes. Makes 12 muffins, they will freeze well, best stored in fridge.