PREPARE THE EGGPLANT: While the sauce is simmering, prepare the eggplant. Preheat oven to 400 degrees. Spray a 13 x 9-inch or other large baking dish with cooking spray or brush with olive oil.
Trim the stem and bottom ends of the eggplant. Slice eggplant in half lengthwise (top to bottom). Cut 5 1/4-inch slices from each eggplant for a total of 10, starting with the middle part of the eggplant. (Depending upon the size of your eggplant, you might be able to get 12 slices.) Reserve the ends for another use.
Line a baking sheet with paper towels. Generously salt the slices of eggplant, then place on the paper towels. Let sit for 30 minutes, then blot the eggplant dry with paper towels. Replace the paper towels with parchment paper. Spray the eggplant with cooking spray. Bake for 10-15 minutes or until the eggplant is pliable. Remove from the oven and let cool. Reduce oven temperature to 375 degrees.
PREPARE THE FILLING: Combine the cottage cheese and ricotta cheese in a mini food processor or blender. Process until smooth. Transfer to a bowl. Stir in 1/2 cup of the Parmesan cheese, 1 cup of the Mozzarella, the parsley, scallions, garlic, egg, and salt and black pepper to taste. Place equal amounts of the cheese filling on each eggplant slice.
ASSEMBLE: Pour 2/3 of the sauce into the bottom of the prepared baking dish. Roll up and place the filled eggplant rolls in the baking dish with the seam side down.
Spoon the remaining sauce over the eggplant rolls then top with the remaining cheese.
Bake uncovered for 30-35 minutes or until heated through, bubbling and the cheese is starting to brown. Cover lightly with aluminum foil and let the Eggplant Rollatini rest for 5-10 minutes.
Sprinkle with chopped fresh parsley and serve over angel hair pasta if desired.