Brown ground beef in medium sized skillet. Drain fat. Mix in taco seasoning and prepare according to package directions. Add salsa & green chiles.
Butter one side of each slice of bread. Cut Velveeta into 6 pieces.
In a large skillet place two pieces of bread, buttered side down. Top each piece of bread with one slice of Velveeta. On top of Velveeta spoon 1/6 of hamburger mixture. Place another piece of bread on top of beef with the buttered side up.
Cook over medium heat until bread is golden brown. Flip sandwich and repeat on other side. Repeat until all sandwiches have been made.