in large bowl combine flour, sugar, baking powder and salt. mix a well in dry ingerients and add eggs, ricotta cheese, milk, vanilla extract and vanilla bean seeds. Blend with a hand mixer or a large spoon until combined. Gently fold in blueberries.
Spoon batter in donut pan about half full. Bake for 8-11 minutes until lightly browned and firm. Cool on wire rack
Use fresh blueberries. If you use frozen and thawed blueberries your batter will become purple unless you drain the bluberries well.