FETA-VEGGIE Biscuits: Combine all ingredients except milk in large bowl. Add milk; stir just until baking mix is moistened. Use #12 scoop to portion batter into 36 mounds (or into 9 mounds for trial recipe) in parchment-lined sheet pan. Bake in 375ºF-convection oven 15 min. or until lightly browned. Remove to wire racks; cool completely.
SANDWICHES: MIX mayonnaise, 1/4 cup of the vinaigrette (or 1 Tbsp. of the vinaigrette for trial recipe) and basil. Toss arugula with remaining vinaigrette.
FOR each serving: Split 1 Feta-Veggie Biscuit; spread 1/2 Tbsp. of the mayo mixture onto each cut side. Fill with 1-1/2 oz. turkey, 2 tomato slices and 1/4 cup arugula.