Preheat the broiler in your oven. In a cast-iron skillet over high heat, melt the butter until frothy then add the ground beef. Stir until the beef is browned and cooked through.
Add the onions and diced tomatoes and chiles. Sauté until the onion is fragrant, about 5 minutes, then add the onion, minced garlic, and jalapeños. Continue to stir to cook the veggies through.
Next, add the cream cheese and cheddar crumbles. Pour the buffalo hot sauce on top and let the cheese melt for a few minutes before stirring the cheese and sauce into the meat mixture. Stir until smooth.
Sprinkle shredded cheddar over the top of the dip and transfer to the preheated oven. Broil for 8-10 minutes, until the cheddar on top is melted and bubbly.
Cool for 20-30 minutes or until the cast iron is cool enough to handle but the dip is still warm. Top with sour cream, shredded cheese, and chives as desired. Serve with a side of tortilla chips, celery – and all of your favorite dippables. Enjoy!