Prepare Cold Brew: Mix 1 1/2 cups of medium roast coffee grounds with 3 cups of room temperature water. Let it steep for 18 hours, then strain to get a smooth concentrate.
Mix Ingredients: In a glass, combine 16 ounces of cold brew with 1 tablespoon of toasted marshmallow syrup.
Add Milk and Cream: Stir in 1 tablespoon of milk and 3 tablespoons of heavy cream for a creamy texture.
Optional Toppings: Add coffee chocolate or other toppings if desired.
Serve: Pour into a glass and enjoy your homemade toasted marshmallow cold brew.