Preheat oven to 350 degrees.: You will notice a warm, dry heat filling the oven, which is essential for even baking and gentle browning. The smell is neutral at first, but once the cookies go in you ll recognize the sweet aroma as sugars start to caramelize. A common mistake is not letting the oven fully reach temperature, which can lead to uneven rise and longer bake times. If your oven runs hot or cool, use an oven thermometer to confirm the 350 degrees reading for steady results. Avoid opening the door early, because fluctuating heat can change the texture.
Combine sour cream, sugar, butter, eggs, and vanilla/almond extract. Beat for 2-3 minutes.: As the ingredients come together you ll see the mixture become glossy and slightly aerated, and the scent of extract will lift the batter. The fat in the butter and the moisture from the sour cream create a smooth emulsion that sets the stage for a tender cookie. If you overmix here you risk developing gluten later when flour is added, so stop once the mixture looks homogenous and creamy. Cold butter will not blend properly, while melted butter can make the dough too loose, so aim for room temperature butter for ease of mixing.
Add dry ingredients and mix well. Add a little flour so at a time so that it's not sticky and is manageable. Wrap dough in plastic wrap. Let the dough chill in fridge for 25 minutes or until firm. Note: A trick I started doing is placing some of the dough in between two sheets of parchment or wax paper and rolling it out to the desired thickness. Put the sheets in the fridge until firm then when ready start cutting into shapes with cookie cutters.: A trick I started doing is placing some of the dough in between two sheets of parchment or wax paper and rolling it out to the desired thickness. Put the sheets in the fridge until firm then when ready start cutting into shapes with cookie cutters. : When you fold in the flour and leaveners the batter tightens slightly and a faint floury aroma mingles with the sweet butter note. Chilling firms the fats so the dough holds shapes, and rolling between parchment prevents sticking while maintaining a clean surface. If the dough feels tacky after adding flour, chilling will make it easier to handle and prevent overflouring which would harden the cookies. Avoid adding all the flour at once, because you might overshoot and dry the dough; instead add gradually until it becomes manageable and slightly tacky but not sticky to the touch.
Roll it out to about 1/4 inch thick and use cookie cutters to make shapes or circles. You may have to add a little flour to roll them out so the dough is workable but remember the less flour you use the softer your cookie will be.: As you roll, you ll notice the dough smooth out and the surface take on a matte finish. The quarter inch thickness yields a cookie that bakes through without losing a soft center, and thin edges that barely brown. Lightly dusting the surface with flour prevents sticking, but using too much will dry the dough and result in a firmer texture, so use the minimum needed. If cutters stick, dip them in flour and tap off the excess before pressing through the dough to keep shapes clean.
Bake until LIGHT golden brown about 8-10 minutes. When you take them out they will seem underdone but they aren't. Let them cool on the pan and they will be perfect and moist. If you like them harder and more crunchy just bake them a little longer.: The oven will sing with a warm aroma as the edges take color and the centers stay pale. Pulling them at the light golden edge ensures a tender center once they cool. Letting the cookies sit on the pan for a few minutes allows residual heat to finish the set while locking in moisture. A common mistake is baking until deeply brown; that yields a firmer, drier cookie. If you prefer a crisper bite bake a little longer, but watch closely because sugar cookies can go from done to overbaked quickly.
For the Buttercream Frosting:: When preparing the frosting you ll detect a sweet, creamy aroma that becomes more pronounced as air is incorporated. Whipping the butter until fluffy creates a light base that lifts the powdered sugar without becoming grainy. If the frosting seems too stiff, add the heavy whipping cream sparingly until it reaches a spreadable consistency; if it s too loose chill briefly to firm up. A common pitfall is adding all the liquid at once, which can make the buttercream runny; add small amounts and taste as you go.
In a mixing bowl, cream butter until fluffy. Add sugar and continue creaming until well blended. Add salt, vanilla, and whipping cream. Blend on low speed until moistened. Beat at high speed until frosting is fluffy.: As you cream the butter the texture will lighten and the color will pale. Incorporating the powdered sugar gradually prevents a powdered cloud and helps maintain a smooth consistency. The salt sharpens the sweetness while the heavy whipping cream brings silkiness to the frosting, and whipping on high makes it airy and easy to spread. If your frosting ends up grainy, continue beating and ensure the powdered sugar is sifted. Overbeating can cause separation, so stop when the mixture holds soft peaks and spreads smoothly.