Cook ravioli according to package directions. Drain and set aside.
Heat medium skillet over medium heat. Add olive oil; swirl to coat.
Add mushrooms, kale, tomatoes and 1 tablespoon butter. Cook 6 minutes, or until mushrooms are soft and tomatoes burst, stirring occasionally. Remove from heat.
Return pasta to medium heat. Add remaining butter and minced garlic. Cook 2 minutes, or until garlic is fragrant, stirring frequently. Stir in bean salad; cook 1 minute, or until heated through.
Gently stir vegetables into pasta. Drizzle with lemon juice. Toss gently and top with red pepper flakes, if desired.