Preparation
Heat oven to 350°F. Cut 2 rounds from each tortilla with
 a 3-inch cookie cutter. Brush both sides of tortillas with 1 tablespoon
 of oil and sprinkle with 1/2 teaspoon of salt. Place rounds in 1 layer 
on cookie sheets; bake until crisp and edges are golden, 10 to 12 
minutes. Remove from oven. Whisk chipotle, remaining 2 tablespoon oil, 
lime juice, tequila, adobo sauce, cumin, sugar and remaining 1/4 
teaspoon salt in a bowl. Place tuna, avocado, 2/3 of scallions and 2 
tablespoons of pumpkin seeds in another bowl. Pour dressing over top and
 gently stir to coat, trying not to break up avocado. Spoon tuna mixture
 onto tortilla rounds. Top with remaining 1 tablespoon pumpkin seeds and
 remaining 1/3 of scallions.