Mix butter, eggs, sugar, salt, vanilla,all-purpose flour, baking powder, baking soda, and heavy cream all together. Fold in lemon peel and blueberries.
Make crumb topping: mix almond powder, butter, all-purpose flour and sugar together.
Spoon into muffin cups, filling each cup 2/3 full. Sprinkle topping onto each muffin.
Bake at 350 degrees F for 25 minutes.