Mix together the first 6 ingredients in a medium bowl.
Preheat oven to 375 degrees and grease a rimmed baking sheet.
Separate the biscuit dough into 8 biscuits and roll or press each one into a 5-inch round.Place 4 on the baking sheet. Top each one with a mound of tuna salad.
Place a slice of cheese on top of each tuna mound. Place the remaining 4 biscuit rounds on top. Stretch and pinch the sides together to completely seal. If desired, use a fork and press it around the edges to help seal them better.