In a medium bowl, combine 2 c. flour, baking powder and salt. Set aside.
Beat milk, 3/4 c. sugar, 1/4 c. butter and egg until creamy. Add dry ingredients and mix just until blended.
Stir in blueberries, zest and juice of 2 lemons.
Spoon batter into a 9 inch round baking pan and sprinkle with crumble topping.
Top with juice and zest of 1 Meyer lemon.
Bake at 350 degrees for 45 minutes.