01 -
Preheat the oven to 350°F. Line a large baking sheet with parchment paper.
02 -
In a large bowl, stir the softened butter, brown sugar, and granulated sugar until smooth and creamy, about 1 minute by hand.
03 -
Stir in the egg and vanilla until the mixture looks glossy and well combined.
04 -
Add the flour, oats, baking soda, salt, and cinnamon. Stir just until the dry streaks disappear.
05 -
Fold in the chocolate chips. The dough should be thick, soft, and scoopable.
06 -
Scoop 2-tablespoon mounds onto the prepared baking sheet, spacing them about 2 inches apart. Keep the mounds tall for thicker cookies.
07 -
Bake for 10-12 minutes, until the edges are set and the centers still look soft. Press a few extra chips on top, then cool on the baking sheet for 8 minutes before moving to a rack.