In a large pan over medium-high heat, add ground beef, jalapeños, onion, garlic, salt, black pepper, and cayenne pepper. Cook until the beef is browned and mostly dry, about 15 minutes.
Stir in chicken broth, cornstarch (if using), strained tomatoes, Dijon mustard, and Worcestershire sauce. Bring to a simmer and cook for 25 minutes, stirring occasionally until thickened.
Sprinkle half of the shredded cheddar cheese over the dip and stir lightly to incorporate. Top with remaining cheese.
Place the pan under a broiler for about 5 minutes, or until the cheese is golden brown and bubbly.
Garnish with red chili flakes and chopped parsley before serving.
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Notes
Store leftovers in an airtight container in the fridge for up to 4 days. Reheat gently before serving.