Be descriptive
Write out each step and be as thorough and descriptive as possible, using every ingredient that is listed. Instead of "mix everything together" write "Mix flour, milk, eggs, and sugar together in a bowl until batter is smooth."
Include temperatures
For recipes that use the oven, include a preheating step and give an exact oven temperature, e.g., 350 degrees F. For stovetop recipes, state how hot the burners need to be, e.g., medium heat, medium-high heat.
Give pan size and type
For baking recipes especially, the wrong size or type of cake pan can seriously affect the outcome of a recipe. Be descriptive and include exact dimensions for any pans used, such as: 9-inch round cake pan, 8-inch square baking dish, 9-inch springform pan, etc.
Include doneness tips
Let the cook know how to tell if the dish is done by including tips and/or temperature guidelines. For example, when baking a cake instead of "Bake for 30 minutes," this is more helpful: "Bake in the preheated oven until a toothpick inserted in the center comes about clean, about 30 minutes."