In a medium skillet over medium-high heat, brown ground beef. Drain off any excess liquid and stir in the package of taco seasoning and a ¾ cup of water. Bring to a boil, reduce heat and simmer for 5 minutes (or until the ground beef is fully cooked), stirring occasionally. Meanwhile, cook the potato browns by either baking them in the oven or deep frying them according to package directions. Drain on paper towels (if deep frying).
Pre-heat a skillet to medium-high heat. Spread butter over one side of a slice of bread. Place butter side down into the skillet. Top with 2 slices American cheese, taco meat, potato crowns, and shredded Mexican cheese blend. Butter an additional slice of bread on one side and place it butter side up on top of the sandwich.
Cook in the skillet until lightly browned on the bottom and flip over. Continue cooking until the other side has browned and the cheese has melted. Repeat with remaining sandwiches.
(Makes 4 Servings)