1 roll (7-1/2 ounces) refrigerated biscuits, quartered
Heat oven to 375 degree F. Heat soup, milk and onion powder in saucepan over medium-low heat until smooth.
Stir in vegetables, tuna and potato. Continue cooking until mixture comes to a low boil.
Transfer to 1-1/2 quart casserole. Top with quartered biscuits.
Bake 18 to 20 minutes or until biscuits are golden brown.