Heat oil in dutch oven on medium-high. Add onion and sauté until translucent.
Add ground beef and sausage and cook until brown and crumbled. Drain off fat.
Add garlic and cook while stirring for 2 minutes
Add tomato paste and stir until combined
Add chili powder, cocoa powder, paprika, cumin, oregano, salt and pepper. Stir until well combined.
Add bone broth, fire roasted tomatoes, and Rotel. Stir until combined. You can add beans here if you like.
For thicker chili: add xanthan gum or masa to a small jar along with a couple of ladles of chili liquid. Put the lid on. Shake until well mixed. Add mixture back to chili and stir until thickened.
Allow flavors to mingle and chili to thicken over medium low heat for 10 min.
Top with: shredded cheese, sour cream, green onions, or jalapeños.