Melt ½ Cup Butter in a small saucepan.
½ Cup Butter
Put 3 ¼ Cup Oatmeal in a mixing bowl, pour the hot butter over it, and mix until the butter and oatmeal are well combined.
3 ¼ Cup Oatmeal
Sift in 1 Cup Cake flour and 3 ¼ teaspoon Baking powder.
1 Cup Cake flour, 3 ¼ teaspoon Baking powder
Then add 1 Cup Potato flour, 1 Cup Granulated sugar, 2 teaspoon Vanilla sugar, 1 dash Kosher salt, ½ teaspoon Ground cinnamon, and 1 teaspoon Lemon zest to the oatmeal.
1 Cup Potato flour, 1 Cup Granulated sugar, 2 teaspoon Vanilla sugar, 1 dash Kosher salt, ½ teaspoon Ground cinnamon, 1 teaspoon Lemon zest
Then add 2 Eggs and 3 tablespoon Milk and mix with a flat beater to form a dough.
2 Eggs, 3 tablespoon Milk
Preheat the oven to 180 °C / 356 °F convection oven and line the baking tray with baking paper.
Using the cookie scoop (small / 1 tablespoon size), cut out cookies from the oatmeal mixture, place them on the baking sheet with enough space between them (5 rows with four cookies per row), and bake for 25-30 minutes until light brown.
Place the finished cookies on the cooling rack and let them cool.