All too often, cakes and other desserts look like they've been mauled and pulled apart by hand instead of cut with a knife. For a more beautiful, picture-perfect slice, The Kitchn recommends buttering up your knife before cutting.
Actually, you only need to wipe on a bit of butter. The Kitchn's recommendation of using saved butter wrappers is an ingenious trick for easily coating the knife so it'll glide through cakes and other crumbly desserts.
3 Tips for Cutting the Perfect Slice of Dessert [The Kitchn]