Cook's Assistant

Walkthrough
Speak with the Cook on Lumbridge Castle's first floor. He will tell the player that he needs ingredients to make a cake for the Duke of Lumbridge's birthday. He wants the player to retrieve flour, milk, and an egg, and to bring those items back to him. Before you set off and collect your ingredients, pick up the pot that's sitting nearby on a table, which you will need later. You'll also want to purchase a bucket from the nearby General Store.

Obtaining milk
To obtain milk, you simply have to use a bucket on a Cow. A bucket respawn point can be found inside the chicken farm across the river near the Goblins, or you can simply purchase one from the General Store beside the castle. Cows can be found by the chicken farm with the bucket or by following the path that leads northwest out of Lumbridge.

Obtaining flour
Before doing anything, make sure you have a pot in your inventory. Now, to obtain flour, follow the path that leads northwest out off Lumbridge. Go past the chicken farm and you'll see a field of wheat. Right-click on one and pick it, you'll obtain grain. Now, go into the windmill beside the field and go to the top floor. Use the grain on the hopper, and then operate the operate. The grain will go down the chute to the bottom of the windmill, so head there. At the bottom, you should see a pile of flour in the center of the room. Simply use your pot on the pile of flour, and you now have flour in your inventory.

Obtaining an egg
Eggs can be found to the northeast of Lumbridge. Cross the bridge going across river and follow the path north. After a little while, you will come across a chicken farm on the west side of the path. Beside the little coup is a single egg that respawns. Pick it up, and if you now have all the items the cook needs, head back to him.

Finale
Once you have all three ingredients, speak to the cook in the castle. He'll take the ingredients and thank you for helping him, completing one of the easiest quests in the game.

Rewards

 * 1 Quest Point
 * Cooking exp
 * Access to the Cook's Range in Lumbridge Castle