Oven Preparation: Begin by preheating the oven to a temperature of 350ºF.

Meat Preparation: In a refined skillet, cook the ground beef until it has fully transitioned from its pink hue. Proceed to drain any residual fat.

Seasoning Addition: Incorporate the taco seasoning to the meat. Subsequently, add the can of diced tomatoes and green chiles. Mix thoroughly and allow to cook for an additional 5 minutes. Once complete, remove from heat source.

Mixture Preparation: In a separate mixing bowl, combine the shredded cheddar cheese with the Ranch dressing. Once blended, integrate the previously cooked taco meat.

Assembly: With meticulous care, spoon the finalized taco meat mixture into the frozen phyllo tart shells. Should you desire to serve at a later time, this would be the appropriate juncture to freeze them.

Baking: Place the assembled bites into the preheated oven and bake for a duration of 8-10 minutes. If baking from a frozen state, it is advisable to extend the baking time by an additional 2-3 minutes to ensure thorough heating.