I adapted several other recipes to create this one, and I like it because it is sweet and crumbly, but doesn't completely fall apart, and doesn't get hard if it sits out overnight...honestly I don't know it might get hard if it sat out for two nights...it's never lasted that long for us!
1 1/4 c white flour (this is one of those rare recipes where I actually use plain white flour)
1/2 c sugar
1/2 c room-temperature butter (don't try to microwave it to soften it, you have to let it just sit out for a few hours so that it's an even consistency through the cube)
Mix flour and sugar together. Cut in butter until mixture is relatively even and crumbly--no large chunks. With your hands, smoosh it together into one large ball.
Pat or roll the ball on a cookie sheet so that it's about 1/2 inch thick (a little thicker is ok, but too thin will get crusty). Shape into a circle and cut wedges, or shape into a rectangle and cut blocks (I prefer to cut blocks). If you have room, use the knife to gently scoot the pieces apart from each other (they don't need much room, but will stick together if they don't have some space).
Bake at 325 for about 20 minutes.
If pieces were not separated prior to baking, re-cut with a knife while still hot.
Let cool on the pan for at least 5 minutes before attempting to eat. 10 minutes is better, but it's really hard to wait that long.