Heat oven to 350 degrees.
Gently fit 1 wonton skin into each of 36 small muffin cups, 1 3/4x1 inch, pressing against bottom and side. Bake 8 to 10 minutes or until lightly golden brown.
Remove from pan; cool on wire rack. Mix remaining ingredients except sour cream.
Just before serving, spoon bean mixture into wonton cups. Top each with 1/2 teaspoon sour cream.