2 HOURS LATER: Preheat oven to 375°F. Shape little balls (about 1/2”-3/4”) from the cookie dough and place into each walnut shape. First press each ball in the middle with a thumb and then using your index finger keep going around the mold pressing the dough until the mold is lined with a very thin layer about 2mm thickness, without any part of mold showing through. Shave off excess with help of a knife. Gently put the cover of the walnut shaped mold over the filled molds, BUT don’t press. Bake for 27-30 minutes. (NOTE: You want them nice and round inside, but without too much extra cookie around the edges once baked. You might need to slightly shave off edges in some cookies once baked to make them perfect or you can leave the way it is. With this crispy dough, it’s very easy to crash sides when shaving off. You can also bake without the walnut mold cover and not worry about shaving sides off. Refer to step 5 if you want to go with this other method). Refrigerate remaining dough while first set is baking. Once baked, remove from the oven, remove the mold cover and remove cookies right away. Usually my walnut shaped cookies are stuck to the cover. You can use a sharp knife to take them off, but don’t poke the sides to prevent from crashing OR like me, I use my hands and gently take them off – they come off very easy because of the butter dough; you’ll even see a bit melted butter right away when you remove each cookie. (Avoid from throwing the baked cookies onto a tray or dish to prevent from crashing – think gentle and place them instead of throwing). Let the mold cool or take it outside to completely cool to bake the remaining dough, otherwise the dough will melt fast and it will be hard to work with; cookies will also bake faster by about 10 minutes if the mold isn’t completely cooled. Let the cookies cool while you make the filling.
TO MAKE THE FILLING: In a medium bowl, combine 1 can dulce de leche and 1/2 stick unsalted room temp butter. Beat on high for about 2 mins until no more butter pieces can be seen. Refrigerate the filling for about an hour. (NOTE: I usually make the filling before I bake the cookies, and let it refrigerate so that it gets thick. It’s much easier to work with thicker dulce de leche than have it leak out of cookies when you’re trying to fill and place together). With help of a dull knife, fill each walnut shaped cookie completely without going over the sides. Gently, without pressing, put 2 pieces together, and place onto a serving dish with the part where the cookies are pressed being around on sides instead of touching bottom of tray to prevent from filling leaking out while these firm up in refrigerator. Enjoy the next day or throughout the week – just keep them refrigerated if these are not being eaten!
BAKE WITHOUT MOLD COVER: Shape and shave off excess cookie dough as you would in step 3, but without covering them with mold cover. Bake at 375°F for approximately 20 minutes. This method bakes with perfect edges, but the only thing I don’t like is that the middles are not as perfect as pressed and when you actually close the cookie, it might have a slightly bigger gap due to the cookie edge top being little bumpy. And to be honest, I go by this method anyway because it’s slightly easier: D ).