Preheat the oven to 400 degrees . In a medium bowl, stir together 3/4 cup jalapenos, the mayonnaise and chipotle chiles. Stir in the tuna.
Divide the tuna mixture among the toast, cover with the cheese and sprinkle with the remaining 1/4 cup chopped jalapenos. Bake until the cheese melts, 8 to 10 minutes.