To begin the quest, you will have to talk with the cook inside the kitchen within Lumbridge castle.
Ask the cook what's wrong, and he will tell you that he's in dire need of some special ingredients to bake a birthday cake for the Duke's
birthday. Accept his request for help and he will explain the special ingredients he needs: a super large egg, some top-quality milk and some fine flour.
While you're in the kitchen, pick up the empty pot on the table for later use.
Next, run north to the General Store and purchase a bucket for later use.
From the General Store, follow the main path north until you reach the mill.
Go into the wheat pasture just outside of the mill, and pick a few bails of wheat.
Enter the mill and speak with Millie Miller. Tell her that you're in search of extra fine flour and she will agree to realign the millstones
in order for them to produce extra fine flour.
Climb up to the top of the mill, and use some wheat on the hopper.
Click operate on the hopper controls that are right next to the the hopper.
Climb back down to the bottom floor, and with an empty pot in your inventory click take-flour from the flour bin.
Run back south towards Lumbridge, this time crossing east over the River Lum and follow east into the cow pen.
Speak with Gillie Groats and tell her that you're in search of some top-quality milk. She will suggest collecting some milk from her prized cow.
Immediately to the east is her prized cow, go over to it and with an empty bucket in your inventory click milk.
Now, exit the cow pen and run a bit north to the chicken coop.
On the ground amonst other regular eggs you will see a super large egg - pick it up.
Now that we have all three ingredients, we can make our way back to Lumbridge castle's kitchen.
Speak with the cook, and hand over all three ingredients and he will be very thankful.
Quest complete!
Here is a video guide taking users on a step-by-step walkthrough on how to complete the Cook's Assistant quest.
