1. Start by preheating your oven to 375 degrees F. This temperature is perfect for baking cookies without them turning too hard. Line two baking sheets with parchment paper or silicone mats to prevent sticking; set them aside.
2. In a medium bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt. Mixing these dry ingredients first ensures they are evenly distributed throughout the dough, giving your cookies consistency.
3. In the bowl of a stand mixer, cream the unsalted butter with both the light brown and granulated sugar together until light and fluffy—this should take about three minutes. The mixture should look pale and airy. Add in the egg and vanilla extract, mixing until combined.
4. Lower the mixer speed to add the dry mixture gradually. Blend until the flour is just incorporated to prevent overmixing, which can lead to tough cookies. Look for a smooth consistency with no visible flour.
5. Using a rubber spatula, gently fold in the old-fashioned rolled oats, white chocolate chips, and dried cranberries. This step is crucial as it ensures those delicious bits are evenly mixed without overworking the dough.
6. Now comes the fun part! Roll the dough into balls, approximately two tablespoons per cookie. Place them on the lined baking sheets, spaced about two inches apart to allow for spreading. Gently flatten the tops with your fingers—this helps them bake evenly.
7. Bake the cookies in your preheated oven for about 10 minutes, until the edges are just slightly golden. Keep an eye on them; you want to ensure they don’t overbake!
8. Once baked, remove the cookies from the oven and let them cool on the baking sheets for two minutes. This cooling time allows them to firm up before transferring them to a wire rack.
9. Transfer the cookies to a wire rack to cool completely. This step is important as it ensures they maintain their texture. Enjoy these delicious cookies fresh from the oven or store them in an airtight container once cooled.