Chop onions, saute in pan with a drop if olive oil

Add sliced keilbasa to onions, brown

Add tomatoes, chicken broth, and tortellini, bring to boil, lower heat to simmer cover for 15 min. Stir occasionally until pasta is tender

Add cheeses, leaving some cheddar jack for topping.

Stir until cheese is melted, cook for additional 5 minutes. Top with rest of cheddar jack, remove from heat, let sit for 5 minutes. Serve warm