The reason that recipes list ingredients at the beginning and not interspersed throughout the instructions is because you can almost always measure, chop, and organize your ingredients ahead of time. Cooking is a lot less of a hassle and challenge when, as long as the heat is on, you're simply adding ingredients to a pot or pan and stirring or flipping occasionally. While what you're doing is perfectly reasonable, context switching still takes on mental effort, and chopping ingredients while things are cooking adds undue stress to the process.