Make the batter: whisk 3 Eggs, and 1 1/2 cups Milk to a mixing bowl
Gradually stir in 1/2 cup Whole wheat flour and 1/2 cup White flour. Once the flour and milk are combinred add 3 tablespoons Butter (melted) and stir.
At this point, the batter will be thin; refrigerate the batter for 20 to 30 minutes to thicken it.
While the crepe batter is chilling, combine 1 pound Ricotta cheese and 1 Egg, in a bowl.
Make the crepes: Heat olive oil an 8-inch skillet or crepe pan over medium to low heat, and preheat the oven to 350 degrees f.
Once the oil is hot, add 1/8 cup of the batter to the pan and swirl it around so that the bottom of the pan is covered with batter.
Cook the batter for one to two minutes and carefully flip it over and cook for another minute or two. Remove the crepes from the pan as they are cooked and stack them on a plate.
Lay the pasta crepes on a flat work surface and add 1/3 cup of cheese mixture. Roll the crepes up.
Add a layer of sauce in the casserole dish and place the stuffed crepes on top.
Cover the casserole dish lightly and bake for 30 minutes.
Remove the cover, sprinkle on the mozzarella cheese and bake until the cheese melts.
Notes
NOTE: You may need to add more oil to the pan when cooking the crepes.All white flour may be used instead of half whole wheat flour and white flour. Store leftover manicotti in an airtight container for up to three days. Reheat leftovers in an oven that's been preheated to 350 degreesF.Freeze manicotti casserole covered or wrapped tightly for up to three months. Defrost it in the refrigerator overnight.