- 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.