1. First, make the chipotle mayo. In a small bowl, stir together mayo, chopped chipotle pepper, lime juice, and salt. Set aside.
2. In a large skillet or grill pan, cook the sliced chorizo over medium high heat, flipping once, until lightly browned, about 3-4 minutes. Place the chorizo on paper towels to drain the grease. Wipe out the pan.
3. Butter the bread slices on 1 side. Spread the unbuttered sides with chipotle mayo. Layer cheese, chorizo, sliced jalapeños and more cheese on top of the chipotle mayo sides of bread. Close the sandwiches with the remaining bread slices, turning the buttered side up.
4. Place the sandwiches back in the skillet or on the grill pan and cook over moderate heat, turning once, until the bread is golden brown and the cheese is melted. Cut the sandwiches in half and serve.
Note-You can find chipotle peppers in adobo sauce in the Mexican section of most grocery stores. You can also find chorizo sausage at most grocery stores.