Homemade oatmeal cream pies featuring a sweet, creamy vanilla bean filling sandwiched between a pair of soft oatmeal cookies.

These Oatmeal Sandwich Cookies with Cookie Butter Frosting feature soft, buttery oatmeal cookies filled with Biscoff Buttercream!

Oatmeal Sandwich Cookies with Peanut Butter Filling from Joy the Baker's new cookbook are actually the best oatmeal cookies ever

Oatmeal Cream Pies with Rum-Raisin Brown Sugar Buttercream Frosting

Peanut Butter Oat Cookies with Chocolate Fluff Filling

Try these Scotch oat crunchies -- crispy sandwich cookies filled with raspberry key-lime jam, from Gourmet's newest cookie book!