Take a food that is known to have a bland or consistent taste and add different things to it to “color” it with flavor, texture, etc.
Foods I could use: Bread, peanut butter, brownies, vanilla ice cream, angel food cake, cornflakes, ramen, pudding, macaroni & cheese, pumpkin pie, pumpkin bread, plain mashed potatoes, oat meal, spinach, grits, porridge, scrambled eggs, rice, beans, apple sauce, toast, corn bread, banana bread, ice cream cone, corn, chicken