Preheat the oven to 425 degrees F. In a medium-size mixing bowl, stir together 1 teaspoon granulated sugar and 1 ¼ cups self-rising flour.
Add in the ½ cup milk and give it a little stir to combine with the self-rising flour mixture.
Stir in the 2 tablespoons of mayonnaise and the mixture will begin to come together to form a ball of dough. Once this happens, stop mixing and prepare the biscuits for baking.
Then drop 6 tablespoonfuls of biscuit dough onto a greased baking sheet, pan, or cast-iron skillet.
Bake at 425 degrees F. for 15 to 20 minutes or until the biscuits have lightly browned. Remove from the oven and all them to cool for 1 to 2 minutes before serving warm.