In a large skillet, brown ground beef, breaking into little crumbles. Drain well. Add taco seasoning packet, tomato paste and water according to package directions. Mix well to combine. Remove the taco meat from pan, set aside. Wipe the fry pan off with a paper towel.
Place the skillet back on the stovetop over medium heat. Brush the pan with olive oil (or butter). Add the tortilla and top with shredded cheese. Add taco meat to half the tortilla. When the cheese is melted fold the tortilla over to a half-moon shape. Press down lightly.
Fry on both sides until crispy. Remove from the pan. Cook the remaining quesadillas in batches.
Slice in half, serve with your favorite taco toppings and enjoy! Sour cream, salsa, jalapenos, olives, etc.
Notes
You can fry with either olive oil or butter. Butter tends to have a little more flavor, but it's a personal preference. Enjoy!