Bring a heavy bottomed pan up to high heat and add enough oil to sauté the veggies & for searing the beef and chorizo.
Add the diced onions, fresh thyme, minced garlic, diced jalapeños and bay leaves to the pan and sauté for 1-2 minutes until the onions are translucent.
Add the ground beef, chorizo and the rest of the spices (chili powder, ground cumin, red pepper flakes and salt) and brown the meat, using a spatula to break it apart in small bits/chunks.Be careful not to break up the bay leaves too much.
Once the beef and chorizo have browned, turn the heat down to low add the pureed tomatoes, brown sugar, black beans, red kidney beans, beef stock & Worcestershire sauce. Stir, cover and allow to simmer for 15 minutes.
Serve hot with your choice of toppings and sides. Store any leftover chili in an airtight container in the refrigerator for up to 5 days.
Use a good quality chorizo. The first ingredient in the chorizo should be "pork." My least favorite chorizo is from a brand that uses pork offals and it is the first listed ingredient. A poor quality chorizo will give the chili a greasy feel and can have cartilage-like chunks.