Grease and flour 9 inch round Springform or other baking pan of similar size (I doubled this recipe to make this 2 layers)
In a mixing bowl, combine butter and granulated sugar and blend for 2-3 minutes until smooth.
With the mixer on low, add the eggs one at a time
Add ricotta, sour cream, vanilla, and lemon zest and mix to combine.
With mixer on low, add flour, baking powder, and salt. Mix until smooth.
Hand fold in the blueberries. Gently combine.
Bake in preheated 350 degree F oven for about 45 minutes or until a toothpick comes out clean.
Remove from oven and cool for 15 minutes in pan.
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