These 3-ingredient shortbread cookies are so good! They melt in your mouth and are gluten-free. You can make them for an afternoon snack or to give as a gift to family and friends. Everyone will love them!
Preheat oven to 350ºF. In a bowl, add condensed milk and softened butter. Mix well until it turns into a smooth cream. Add cornstarch and mix with a spatula. When it starts to get difficult to mix with the spatula, use your hands. Mix until it forms a very soft dough. (If you wish to use lemon or orange zest, add it with the cornstarch).
Take small portions and roll by hand. Place on a baking sheet (no need to grease) about 2" apart, and lightly press them with your hand. Make the design you want. The most common is pressing the dough with the back of a fork. I also like using a butter knife and pressing to form a cross or asterisk. If you want to decorate with sprinkles, you can do it now.
Bake for 9-11 minutes, more or less, depending on your stove and your preference. If you like the cookies crunchy on the outside and soft on the inside, remove them from the oven before browning underneath. But if you like it all crunchy, bake until lightly browned on the bottom. Don't let it brown too much as the cookies start to get too dry.
Notes
*It's important to soften the butter so it's easy to mix and the dough gets to the right consistency.*Usually, it is not necessary to refrigerate the dough before baking, but if your kitchen is too hot and the dough is too soft, refrigerate the dough for about 15 minutes. This will prevent the cookies from spreading too much in the oven and losing their shape.