Preheat the oven to 325 F and line a large baking sheet with parchment paper.

Combine the flour and spices, then add the oil, sugar and peanut butter mixture. Stir slowly by hand, or with an electric mixer on low speed. 

If the dough looks dry, add a little more peanut butter

Shape the dough into walnut-sized balls. Place them about 1 inch apart on the lined baking sheet. Flatten the cookies slightly and press a nut into the center of each.

Bake cookies on the middle rack of the oven until set and light brown – around 20-24 minutes. 

Remove from the oven. They will harden as they cool on a wire rack. Sprinkle with powdered sugar while still warm!