Preheat the oven to 400°F (205°C).
Prep all the ingredients per the instructions above.
Heat a large pot over medium heat. Once hot, add the oil and saute the onions, peppers, and garlic until softened. Add the beef, along with the measured-out chili powder, cumin, and paprika. Brown the ground beef while breaking it up into smaller pieces with a spatula.
Stir in chicken broth, crushed tomato, tomato paste, and beans (if using). Season with salt and pepper. Cover with a lid and bring to a simmer for about 30 minutes to build flavor.
Make the corn muffins: Grease muffin cups with nonstick spray or line with paper liners. Melt the butter. In a mixing bowl, whisk together the flour, cornmeal, sugar, baking powder, baking soda, and salt.In a separate bowl, whisk together the buttermilk, beaten egg, and melted butter.Add the wet ingredients to the dry ingredients and stir until just combined. Do not overmix. Spoon the batter evenly into the prepared muffin cups, filling each cup about 2/3 full.Bake for 12-15 minutes, or until the muffins are golden brown and a toothpick inserted in the center comes out clean.Remove the muffins from the oven and let them cool in the muffin tin for 5 minutes. To finish the chili: Taste the chili and adjust the seasoning with salt and pepper or additional spices if needed.
To serve: Portion the chili into bowls, sprinkle the cheese over top, and garnish with scallions and jalapeno (if using). Serve with corn muffins and milk.