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Bailey's uses a special process to combine two otherwise incompatible ingredients: cream and whiskey. This secret technique keeps the cream from clumping and separating from the whiskey, and allows the liqueur to go for two years unrefrigerated without spoiling. But we won't need to tap into any secret preparation techniques for our clone here since well be storing the liqueur in the refrigerator. We will, however, replace cream with canned evaporated milk. This gives us a properly sweetened finished product with the taste and texture of the deliciously famous Irish cream. Here now is an improved version of the Bailey's clone recipe that appears in More Top Secret Recipes. This version has fewer ingredients, is easier to make, and tastes amazing.
Source: Top Secret Recipes: Sodas, Smoothies, Spirits & Shakes by Todd Wilbur.