das Rezept
recipe
Instructions for preparing a particular dish, with a list of ingredients and the individual steps.
Hast du das Rezept für diesen leckeren Kuchen für mich?
Do you have the recipe for this delicious cake for me?

recipe / prescription
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recipe
Instructions for preparing a particular dish, with a list of ingredients and the individual steps.
Hast du das Rezept für diesen leckeren Kuchen für mich?
Do you have the recipe for this delicious cake for me?

'Das Rezept' means 'recipe' (cooking instructions) or 'prescription' (doctor’s order) in German. It is a false friend of the English word 'receipt', which is 'der Kassenbon' or 'die Quittung' in German.
Ich brauche ein Rezept vom Arzt, um dieses Medikament zu kaufen.
I need a prescription from the doctor to buy this medication.
You can tell from context whether a cooking recipe or a doctor’s prescription is meant. Words like 'kochen' (to cook), 'Zutaten' (ingredients), or 'Kuchen' (cake) point to cooking instructions, while 'Arzt' (doctor), 'Apotheke' (pharmacy), or 'Medikament' (medication) indicate the medical meaning.
Ich habe ein tolles Rezept für eine Gemüsesuppe gefunden.
I found a great recipe for a vegetable soup.
In a culinary context, 'Rezept' (recipe) is often used with certain verbs. Typical phrases are 'nach Rezept kochen' (to cook according to a recipe), 'ein Rezept ausprobieren' (to try out a recipe), or 'sich an ein Rezept halten' (to follow a recipe).
Für diesen Kuchen musst du dich genau an das Rezept halten.
For this cake, you have to follow the recipe exactly.
In a medical context, the most common verbs are 'ein Rezept ausstellen' (the doctor writes/issues a prescription), 'ein Rezept einlösen' (the patient fills a prescription at the pharmacy), and 'ein Medikament verschreiben' (the doctor prescribes a medication).
Mein Arzt hat mir ein Rezept für Physiotherapie ausgestellt.
My doctor wrote me a prescription for physiotherapy.
plan
'der Plan' and 'das Rezept' can both describe how you want to achieve a goal. 'der Plan' is more general: it shows what you want to do and how you want to proceed. 'das Rezept' is usually detailed instructions for cooking. Figuratively, it can also be a proven method for a problem. The words can be confusing because both can contain steps or an approach. For projects, trips, or goals, you usually say 'Plan'. For a dish or a fixed formula for success, 'Rezept' fits better.

Auf der Feier fragt die Ärztin nach dem Rezept für den Kuchen.
At the party, the doctor asks for the recipe for the cake.
Für das Projekt machen wir morgen einen genauen Plan.
Tomorrow we will make a detailed plan for the project.