Start by lining your workspace or cookie sheet with parchment paper for easy cleanup.

In a large bowl, combine dry ingredients: the old-fashioned oats and chopped pecans, ensuring they are well mixed. Set this bowl aside.

Cut the unsalted butter into 2-tablespoon portions.

In a medium saucepan, combine the sliced butter and maple syrup. Cook over medium-high heat, stirring constantly, until the mixture reaches a temperature of 240°F on a candy thermometer (this should take about 10 minutes). This step is crucial for the cookies’ success.

Once the syrup mixture reaches the correct temperature, pour it over the oat and pecan mix. Stir well to ensure the syrup is evenly distributed throughout the oats and nuts.

To flatten each cookie, lightly spray a flat-bottomed measuring cup or similar item with nonstick cooking spray. Press down on each cookie mound to create an even shape, and use your fingers to tidy the edges if necessary.

Let the cookies sit for one hour. Afterward, gently flip each perfect cookie, which may still feel a little tacky — that’s completely fine! Allow them to sit for another hour after flipping.

If desired, top each cookie with a whole pecan before serving. Enjoy your delicious chewy cookies!