Heat a large pot over medium heat.
Add the extra virgin oil and onions.
Cook for 3-4 minutes until onions start to turn color (keep stirring the onions throughout this process.)
Add the beef and sausage and continue to cook until all pink is gone in meat.
Add garlic and flour and mix very well.
Keep cooking and stirring for 2 minutes until meat and flour are mixed well.
Season with 1 teaspoon of salt and 1/2 teaspoon of black pepper.
Add the beer and incorporate well for about 1 minute.
Add chili powder, cumin, cayenne pepper, tomatoes and stir well.
Decrease the heat to medium and keep stirring until all products are very well mixed.
Reduce heat to low and simmer for 15-20 minutes.
Top with sour cream, cheddar cheese, and chopped scallions.