To make a donut in Grow a Garden (Roblox), you need to gather specific ingredients and cook them in the cooking pot during the event. Here are some of the known recipes to make a donut in the game:

• Basic recipe: 1 Corn, 1 Blueberry, and 1 Strawberry.
• Alternative recipe: 1 Strawberry, 1 Tomato, and 1 Apple.
• Simple recipe: 1 Corn and 1 Watermelon.
• Another option: 2 Sugar Apples and 1 Corn.
• Or: 1 Sugar Apple and 2 Corn.
• Some other combos include 1 Corn, 1 Serenity, 1 Sugar Apple; 1 Corn, 1 Mango, 1 Banana.

The cooking time is around 5 minutes. Once cooked, collect the donut by pressing E and you can give it to Chris P. Bacon for rewards if he is craving a donut at that time. You can experiment with these ingredient combinations to make donuts and get rewards in the Grow a Garden cooking event.