Heat oven to 450°F. Line cookie sheet with foil.
In 2-quart saucepan, stir refried beans, tomatoes, broth, coconut milk, green chiles and taco seasoning mix; heat to boiling. Reduce heat to low; simmer uncovered about 20 minutes.
Meanwhile, cut each cheese stick in half lengthwise to make 2 thin sticks. Place 1 cheese stick on one edge of each tortilla; roll tortilla tightly around cheese. Brush edges of tortillas with water to seal. Place taquitos, seam sides down, on cookie sheet. Brush each lightly with oil. Bake 5 to 7 minutes or until edges of tortillas are golden brown and cheese is melted.
Pour soup into serving bowls; garnish with cilantro or onions. Serve with taquitos for dipping.