Preheat the oven

• Preheat the oven to 180 °C.
• Line the baking trays with baking paper.

Cream the butter and sugars

• Beat the softened butter with the brown sugar and granulated sugar until light and fluffy.
• Beat in the egg and vanilla extract until smooth.

Mix the dry ingredients

• In another bowl, combine the flour, rolled oats, baking soda, salt and cinnamon.

Make the dough

• Add the dry ingredients to the butter mixture and stir until just combined.
• Do not overmix the dough.

Shape the cookies

• Scoop the dough into balls and place them on the prepared trays, leaving space between them.
• Flatten each ball slightly with your fingers.

Bake the cookies

• Bake until the edges are golden but the centers still look soft.
• Let the cookies cool on the tray for a few minutes before transferring them to a rack.