Heat olive oil in a large Dutch oven or heavy skillet over medium-high heat for exactly two minutes until shimmering. Working in two batches to avoid crowding, sear beef cubes for three minutes per side until deeply browned. Transfer to your slow cooker—the Maillard reaction creates the savory foundation your elegant slow cooker dinner needs.

In the same skillet, sauté diced onion for four minutes until softened and translucent. Add minced garlic and cook for one minute until fragrant. This aromatic base prevents raw garlic flavor from dominating the final dish.

Add chili powder, cumin, paprika, and oregano to the onion mixture and stir constantly for 90 seconds. Toast the spices in the residual oil—this technique blooms volatile flavor compounds. Transfer this mixture to the slow cooker with the beef.

Pour in crushed tomatoes, tomato paste, beef broth, and diced jalapeño. Stir thoroughly to distribute tomato paste evenly throughout the stunning slow cooker beef chili recipe. Season with salt and pepper, then stir in both drained beans. Set slow cooker to LOW and cook for eight hours untouched.

After eight hours, stir the chili and taste carefully. If you prefer thicker consistency, use an immersion blender to purée one-third of the mixture, then stir back in. This maintains chunky texture while increasing body—Marco's personal technique for restaurant-style results.

For serving immediately, ladle into bowls and top as desired. For make-ahead convenience, cool completely before refrigerating in airtight containers up to four days, or freezing up to three months.