In a large nonstick skillet melt the 1 tablespoon butter over medium-high heat. Add spinach. Toss in skillet for 30 to 60 seconds or just until spinach wilts. Remove from heat. Transfer to a large bowl. Stir in chicken, water chestnuts, mozzarella cheese, cottage cheese, Parmesan cheese, salt, nutmeg, and pepper.
Preheat oven to 375 degrees F. Coat a 3-quart rectangular baking dish with cooking spray; set aside.
Spread about 2 tablespoons of the chicken-spinach mixture over half of each crepe. Fold each crepe in half; fold in half again, forming a triangle. Arrange filled crepes in the prepared baking dish, overlapping slightly.
Bake for 20 to 25 minutes or until heated through.
Meanwhile, for mushroom sauce, in a large nonstick skillet melt the 2 tablespoons butter over medium heat. Add onion; cook for 2 minutes. Add mushrooms; cook for 5 minutes more. Add broth and bouillon granules; cook and stir until boiling, scraping up browned bits from the bottom of the skillet. Stir in whipping cream. Simmer, uncovered, for 10 to 12 minutes or until sauce is thickened and bubbly. Add Marsala; cook and stir for 1 minute more. Serve mushroom sauce over filled crepes. If desired, sprinkle with parsley.
In a blender combine all ingedients; blend until smooth.
Heat a lightly greased small skillet over medium-high heat; remove from heat. Pour in about 2 tablespoons of the batter; lift and tilt skillet to spread batter evenly. Return to heat; cook 1 minute or until browned on one side. Turn crepe over; cook 1 minute more. Slide crepe onto paper towel-lined plate. Repeat with remaining batter, greasing skillet occasionally. If crepes are browning too quickly, reduce heat to medium.