Combine the milk, water, eggs
, flour, salt and sugar in a blender
. Blend on medium speed for 15 seconds, until the batter is smooth and lump-free. Scrape down the sides of the blender and pour in 3 tablespoons of melted butter. Blend it again for a second just to incorporate. Refrigerate the batter
for 1 hour to let it rest. If the crepes are made immediately, they have a tendency to be rubbery; when you let the batter rest, the crepes have a better texture and a softer bite.
Put an 8-inch crepe pan or nonstick skillet over medium heat and brush with a little melted butter for added assurance. Pour 1/4 cup of batter into the pan and swirl it around so it covers the bottom evenly; pour back any excess. Cook for 30 to 45 seconds, until the crepe batter sets. Lightly bang the edge of the pan with a wooden spoon to loosen the crepe; then flip it and cook another 30 seconds. The art of flipping a crepe in the air takes practice, so make sure no one is looking when you get the first one going. If this intimidates you, use a heatproof rubber spatula to loosen and flip the crepe. The crepes should be pliable, not crisp, and lightly brown. Slide them onto a platter and continue making the crepes until all the batter is used. Cover the stack of crepes with a towel to keep them from drying out. This makes 10 crepes.
Assembly: Preheat the oven to 400 degrees F. Forming the blintzes is kind of like making burritos
. Spoon 1/4 cup of the cheese filling along the lower third of the crepe. Fold the bottom edge away from you to just cover the filling; then fold the 2 sides in to the center. Roll the crepe away from you a couple of times to make a package, ending with the seam side down. Put an ovenproof skillet over medium heat. Brush with melted butter. Pan-fry
the blintzes for 2 minutes per side until crisp
Transfer the pan to the oven and bake for 10 minutes so the egg in the filling cooks slightly and the cheese sets. Using a spatula
, transfer the blintzes to serving plates. Spoon the blueberry sauce on top, dust
with confectioners' sugar, and serve right away.
Serve with chopped banana
and remaining blueberry sauce
. Sprinkle with powdered sugar