In a large skillet, heat 2 teaspoons oil over high heat. Add half of the meat in a single layer and sear on one side (about 5 minutes) Transfer to a 5- to 6-quart slow cooker along with remaining un-seared meat.
In same skillet, add 2 more teaspoons oil, onion, bell pepper, jalapeño, and garlic over medium-high heat, stirring and scraping up browned bits with a wooden spoon, until vegetables are tender, 5 minutes.
Add cumin, chili powder, oregano, and flour and cook 1 minute, stirring.
Slowly pour broth into skillet, stirring until liquid is smooth, scraping up any bits stuck to the pan. Simmer 2 minutes, then transfer mixture to slow cooker, along with tomatoes and bay leaves, salt and pepper.