My copycat Tim Hortons Hot Chocolate recipe is made with four simple ingredients, and it tastes just like the original. You can mix it with warm water or milk, but I recommend milk for the extra creaminess.
Combine cocoa powder, sugar, milk powder, and cornstarch in a medium bowl. Whisk thoroughly. Pass it through a fine-meshed strainer to get rid of lumps.
Use ¼ cup of powder for every cup of hot chocolate. Whisk the ingredients together in a small saucepan and bring to a boil over medium-high heat. Whisk constantly to ensure the cornstarch doesn't settle at the bottom.
Notes
Storage: Store hot cocoa mix in the pantry for up to 6 months, depending on the freshness of your milk powder.