Mary Berry has some good traditional recipes availiable online. This is our all time favorite a lemon drizzle tray bake
https://www.maryberry.co.uk/recipes/...izzle-traybake. Her recipes always seem to work for me.
If you don’t already own a set a scales for weighing you ingredients consider buying some. I avoided it for years but have to say good kitchen scales make baking a breeze.