Combine first 4 ingredients. Set aside.
Press each biscuit into a 4-inch circle. Place biscuit circles on a lightly greased baking sheet.
Bake at 400° for 6 minutes. Spread each biscuit evenly with about 2 teaspoons mayonnaise mixture. Top evenly with tomato slices. Bake at 400° for 6 more minutes or until mayonnaise mixture is bubbly. Serve immediately.
Note: For testing purposes only, we used Pillsbury Golden Layers Buttermilk Biscuits.