In a large bowl, combine ground beef, ground pork, cumin, salt, oregano and black pepper. Mix together until well combined.
Add the meat mixture to a large pot over medium-high heat and cook until no longer pink, about 5-8 minutes. Drain off the grease and transfer the meat to the side for now.
Add the ghee, onions, red bell peppers, and poblano peppers to the first pot. Reduce heat to medium-low and cook for 15 minutes, stirring occasionally, until the veggies are soft and the onions start becoming translucent.
Add the garlic and red pepper flakes and cook for 1 to 2 minutes, until garlic is fragrant but not burned.
Add the black and pinto beans, beef broth, diced tomatoes, tomato paste, chili powder and the cooked pork and ground beef back into the pot. Mix together and bring to a boil, then reduce heat to simmer and cook for 50 minutes, stirring occasionally.
Mix 1 Tbsp cornstarch into 1/2 cup of water and pour into the chili, stirring well. Let simmer for 10 minutes, stirring occasionally, until thickened.
Plate up with cilantro, jalapeƱos, crushed tortilla chips or fresh limes!