Preheat the oven to 350 degrees F (175 degrees C).

Grease a 9 inch square baking dish.

In a large bowl, stir together the flour, 3/4 cup of sugar, and baking powder.

Add the milk, shortening, 1 egg, and lemon extract to the flour mixture.

Use an electric mixer to mix on low speed for 1 minute, then on medium speed for 1 minute.

Pour the batter into the prepared pan and spread evenly.

Sprinkle blueberries over the batter.

In a medium bowl, stir together 2 beaten eggs, ricotta cheese, 1/3 cup of sugar, and vanilla extract.

Spoon the ricotta mixture over the blueberries and spread evenly.

Bake for 55 to 60 minutes in the preheated oven, until a knife inserted near the center comes out clean.

Cool completely before cutting into squares and serving.