COOK first 4 ingredients in large saucepan on medium-low heat 5 min., stirring frequently. Stir in stock and tomato paste. Bring to boil on medium-high heat.
ADD all remaining ingredients except spaghetti; stir. Simmer on medium-low heat 15 min., stirring occasionally. Meanwhile, cook spaghetti as directed on package, omitting salt.
DRAIN spaghetti. Serve topped with chili.
