1 cup vanilla yogurt or frozen vanilla yogurt
2 cups honeydew melon (cut into 1-inch chunks, no rind)
2 cups Galia melon, cantaloupe, or other muskmelon (cut into 1-inch chunks, no rind)
1 tablespoon fresh lime juice
6 fresh mint leaves (plus 2 extra sprigs as garnish, optional)
6 Ice cubes