Brown the beef: In a large skillet, cook the ground beef over medium-high heat until it's no longer pink. Drain excess grease.

Season the meat: Return the beef to the skillet, mix in the taco seasoning and water. Simmer on low heat for 3-4 minutes until the mixture thickens, stirring often.

Heat the griddle: Warm up a flat griddle or large skillet over medium heat for the quesadillas.

Assemble the quesadillas: Lay out a tortilla, sprinkle 1/4 cup of cheese on one half, add 1/4 - 1/2 cup of the taco meat, and top with more cheese. Fold the tortilla over to close.

Cook until crisp: Place the quesadilla on the griddle, cooking each side for 2-3 minutes until golden brown and the cheese is melted.

Serve: Let the quesadilla cool slightly, then cut into wedges. Serve with your choice of toppings.