Preheat your oven to 350ºF (175ºC).

In a large skillet, brown one pound of ground beef over medium heat, about 7-10 minutes.

Stir in taco seasoning and undrained diced tomatoes with green chiles, then simmer for 5 minutes.

Combine shredded cheddar cheese with ranch dressing in a bowl until smooth.

Stir the cheese mixture into the beef mixture until well combined.

Spoon the mixture into phyllo tart shells and arrange on a baking sheet.

Bake for 8-10 minutes, or longer if using frozen tart shells.

Let cool for a few minutes before serving with toppings like sour cream or jalapeños.