Scrub potatoes; prick each several times with a fork. Bake at 400° for 45 minutes or until done.
Position knife blade in food processor bowl; add beans, water, 1/4 cup lemon juice, 1/2 teaspoon Greek seasoning, and 1/4 teaspoon salt. Process 1 minute or until smooth. Combine remaining 1 tablespoon lemon juice, 1 teaspoon seasoning, and 1/4 teaspoon salt; add tomato, olives, and pepper, stirring well.
Cut a lengthwise slit in top of each potato. Press ends of each potato toward center, pushing pulp up. Top potatoes evenly with bean mixture and tomato mixture; sprinkle with cheese.