Mash 1 1/2 c. beans; set aside: In Instant Pot®, heat oil on sauté. Add garlic and onion. Sauté 5 min. Add cabbage; sauté 5 minutes or until cabbage wilts. Add mashed and whole beans, carrots, and broth. Press cancel. Lock lid; set valve to sealing. Program for manual-high, and 4 minutes. Allow at least 10 min natural pressure release. Serve with cheese and garlic toast, if desired.