In the Northrend
wotlk classic, cooking is a good profession, but lot of people don't know how to leveling, today I'll show you.
1. 350 - 400
The cheapest way to level from 350-400 is by making Kungaloosh I. This recipe however can only be learned by completing a long quest chain in Sholazar Basin, ending with the quest Fletcher's Lost and Found, which will automatically teach you how to make Kungaloosh . Since both of the reagents needed to make Kungaloosh can be purchased from a vendor, this recipe is very easy and cheap to make, only costing around 50 silver per skill-up.
Recipe
Use 1 x Imperial Manta Ray
Use 1 x Succulent Clam Meat
Use 2 x Musselback Sculpin
Use 1 x Chunk o' Mammoth
Use 1 x Fangtooth Herring
2. 400 - 425
Black Jelly is the best way to level from 400-425 as it does not require Northern Spices to make, allowing you to easily level up. Be sure to check the price of Borean Man O' War on your server and try to buy it whenever it is cheap.
3. 425 - 450
The only way to continue leveling at this point is by using one of the patterns that can be purchased with Dalaran Cooking Award. This will require you to complete cooking dailies to be able to purchase the recipes. Below is a list of all of the recipes you can buy and use to finish leveling your cooking skill to 450. Some food will be in higher demand than others, make sure to check your server's auction house to find whichever food is in highest demand.
Take 3 Dalaran Cooking Award, you can change many recipes, like Cuttlesteak, Dragonfin Filet, Firecracker Salmon, Hearty Rhino and so on, these recipes can help your cooking leveling 425 - 450.