Lightly coat both sides of bread slices with cooking spray; arrange in a single layer on a baking sheet. Bake at 350° for 10 to 12 minutes or until lightly browned, turning once.
Combine sun-dried tomatoes and water in a small bowl; cover and let stand 15 minutes. Drain and finely chop tomatoes. Combine sun-dried tomato, plum tomato, and next 3 ingredients. Cover and let stand 1 hour.
Combine mashed beans and lemon juice. Spread bean mixture evenly over bread slices. Broil 5 1/2 inches from heat (with electric oven door partially opened) 1 to 1 1/2 minutes or until thoroughly heated. Spoon tomato mixture evenly over bean mixture. Garnish with basil sprigs, if desired. Serve immediately.