If you're cooking or baking, "stir in additionally" may be a phrase you come across frequently in recipes. However, there are a variety of synonyms you can use to add variety to your recipe writing. Consider using "fold in" or "mix in" for a more gentle approach, or "whisk in" or "incorporate" for a more vigorous mixing technique. "Blend in" or "combine" could also be useful choices. To convey a sense of slowly building the recipe, try "add gradually" or "sprinkle in." Whatever variation you choose, remember to be clear in your instructions so that readers can execute your recipe successfully.