Mix together in a bowl:
1 cup quick oats (must be quick-cooking oats otherwise the consistency will be funny)
3 tbsp flour
1 tsp baking powder
1/2 tsp salt
1 tsp cinnamon
Blend together until creamy:
1/2 cup unsalted butter
1 cup packed brown sugar
Then add 1 egg and 1 tsp vanilla to your butter-sugar mixture and blend until smooth.
Add the dry ingredients and mix until combined.
You need to give these cookies space on the tray, they need to have at least 2 inches between them. Drop teaspoon sized spoonfuls onto a tray lined with parchment paper. Bake in the oven at 350 degrees for 7 minutes (between 5-9 minutes depending on your oven, you want the cookies to be golden brown). Let cool on the tray for 5 minutes.