Scottish-ish shortbread in three ingredients

About 5 minutes prep, 30-35 mins baking.
Adapted from The Joy of Cooking

Preheat oven to 325°

1 cup semi-salted butter
2 cups unbleached white or rice flour (or a combination of both)
1/4 cup sugar

1. Place butter in medium bowl, cream by squeezing with hands until creamy.
2. Add flour and sugar, mix with hands
3. Press well-mixed dough into 9" square pan
4. Poke dough with fork, about one poke per inch or so.
5. Bake at 325°F for 30-35 minutes, until golden brown.
6. Remove from oven, let sit for a couple of minutes, cut while hot.

For fancier but not much more complicated results, add something to step 2: lemon rind, lavender and white pepper all work well.