Brown the meat: In a large skillet over medium heat, cook the ground beef and mixed ground meat until browned. Drain excess fat if needed.
Sauté the aromatics: Add the diced onion and garlic to the skillet and cook for 2-3 minutes until softened. Stir in the chili powder, cumin, salt, and pepper, cooking for another minute until fragrant.
Layer in the crockpot: Transfer the meat mixture to the crockpot. Stir in the brown sugar, tomato paste, beer, beef broth, diced tomatoes, tomato sauce, and beans. Mix well.
Slow cook: Cover and cook on low for 6-8 hours or high for 4-5 hours, stirring occasionally.
Taste and adjust: Before serving, taste the chili and adjust seasoning as needed. If you prefer a thicker consistency, let it cook uncovered for the last 30 minutes.
Serve: Enjoy hot with shredded cheese, cornbread, or sourdough bread on the side.