01 -
Turn the oven on to 350 degrees F to warm up.
02 -
Mix together flour, sugar, and melted butter in a bowl. Use your fingers to blend until crumbly. Put it aside for now.
03 -
Take a big bowl and put sugar with lemon zest in it. Use your fingers to rub them together until it smells nice. Add flour, baking powder, and salt. Stir it all together and set aside.
04 -
In another bowl, stir together the ricotta, eggs, lemon juice, and vanilla. Slowly pour in the melted butter while stirring until everything looks smooth.
05 -
Pour the wet mixture into the dry ingredients. Stir just enough to mix them together. Don't stir too much. Gently add the blueberries, being careful not to mash them or your batter will turn blue.
06 -
Spray a 9-inch springform pan with cooking spray all over. Pour the batter into the pan evenly and sprinkle the crumbly topping all over.
07 -
Let it bake for 45 to 55 minutes. Check if it's done by poking the middle with a toothpick - it should come out clean. Take it out and let it cool on a rack for half an hour before opening the sides of the pan.
08 -
Mix powdered sugar with lemon juice in a bowl. Start with 2 tablespoons of juice and add more if you want it thinner.
09 -
Pour the icing over the cake once it's cooled down. Slice it up and enjoy.