Preheat the oven to 200°F.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
1-1/4 cups all-purpose flour, 3 tbsps. granulated sugar, 2 tsps. baking powder, 1/2 tsp. baking soda, 1/4 tsp. table salt
In a medium bowl, whisk together the ricotta, egg, egg whites, lemon juice, lemon zest, and canola oil. Gently fold this mixture into the dry ingredients until combined; the batter will be thick.
1 cup part-skim ricotta cheese, 1 large egg, 2 large egg whites, 1/2 cup fresh lemon juice, 2 tsps. grated lemon zest
Heat a nonstick skillet over medium-low and lightly brush with canola oil. Using a ¼-cup measure, drop the batter onto the skillet, spreading it slightly.
1 tbsp. canola oil
Cook until the underside is golden brown and the pancakes begin to set, about 2 minutes. Flip and cook for another 2 minutes, until the second side is browned and the center is cooked through.
Transfer the cooked pancakes to a baking sheet and place them in the oven to keep warm. Brush the skillet with more oil and repeat with the remaining batter.
For the blueberry sauce, stir together the lemon juice and cornstarch in a small bowl and set aside. In a medium saucepan, combine the blueberries, sugar, water, and salt. Bring to a boil over high heat, then reduce to a simmer. Stir in the lemon juice-cornstarch mixture and cook, stirring, until the sauce thickens slightly, about 2 minutes. Cover and set aside. Spoon the warm blueberry sauce over the pancakes before serving.
1-1/2 tbsps. fresh lemon juice, 2 tsps. cornstarch, 2-1/4 cups fresh or frozen blueberries, 1/3 cup granulated sugar, 2 tbsps. water, 1/4 tsp. table salt