In a large bowl, whisk together all crepe ingredients until smooth. Cover and refrigerate for at least 30 minutes.
Heat a 6-inch skillet over medium heat and brush lightly with oil.
Holding the pan in one hand, spoon about 1/3 cup crepe batter and immediately rotate and tilt the pan to completely cover the bottom. Pour excess batter back into bowl.
Cook crepe for one minute until edges turn brown and lift away from pan. Flip with fingers and cook 30 seconds more until spotted brown.
Slide cooked crepe onto a plate and cover with wax paper. Repeat with remaining batter, stacking crepes with wax paper between each.
Preheat oven to 350°F.
For filling, stir all filling ingredients together in a large bowl until well combined.
Spoon a thin layer of marinara sauce into a 13x9x2 inch baking dish.
Place about 1/4 cup filling lengthwise down center of each crepe, roll up, and place seam side down in dish.
Continue with remaining crepes and filling, placing them close together in the dish.
Spoon remaining marinara sauce over manicotti and sprinkle with 1/2 cup parmesan cheese.
Bake for 30-45 minutes until sauce is bubbling and manicotti are heated through. Serve hot.