Peel the eggplants, if desired (this makes the casserole easier to cut). Cut into 1/4-inch slices. Pre-cook the slices until they are partially dehydrated.
To microwave, cover the bottom of the microwave with two layers of paper towels. Place eggplant slices in a single layer and cook on high power for 8-10 minutes, until reduced in size and beginning to shrivel. Repeat with remaining eggplant.
To pre-cook in the oven, place on a silicone baking mat or parchment-covered baking sheet. Bake at 450 F until slices are shriveled but not brown or crispy.
While the eggplant is cooking, prepare the sauce, if you’re making it from scratch. Sauté the onion in a non-stick skillet until softened; add the garlic and cook for another minute. Set aside. Remove 1/2 cup of the diced tomatoes and set aside. Put remaining tomatoes and sauce ingredients into blender and blend until smooth. Add reserved tomatoes and onions to blender and stir to combine (do not blend).
Prepare the filling by placing all ingredients into a food processor and processing until smooth.
Preparing the Casserole
Preheat oven to 425. Spray a mid-sized rectangular casserole dish (I used 11×7-inch) with canola oil or non-stick spray. Put a thin layer of sauce in the bottom of the dish–just barely enough to cover the bottom. Arrange 1/3 of the eggplant slices over the sauce. Spread 1/2 of the bean filling over the eggplant, and put half of the zucchini or other vegetables over the filling. Drizzle lightly with sauce. Repeat eggplant, filling, zucchini, and sauce. Place the final layer of eggplant over the top, and pour the remaining sauce evenly over it, spreading it to cover the eggplant completely.
Bake uncovered for about 30 minutes. Check to make sure that zucchini is cooked and sauce has thickened; if not, add more time. Remove when done and allow to sit for a few minutes before serving. Sprinkle with chopped parsley as garnish.
For the tofu filling, follow the instructions in My Favorite Lasagna.With tofu filling: 183 Calories (kcal); 5g Total Fat; (22% calories from fat); 14g Protein; 24g Carbohydrate; 0mg Cholesterol; 452mg Sodium; 10g Fiber. With either filling, one serving is zero points on Weight Watchers Freestyle program.