1-First Step: Preheat and Prep Start by preheating your oven to 350°F (175°C) to get everything ready for baking these chewy monster cookies. Line two baking sheets with parchment paper for easy cleanup and to prevent sticking. Gather all your ingredients like butter, sugars, peanut butter, egg, vanilla, flour, oats, salt, baking powder, baking soda, chocolate chips, and candy-coated pieces to make the process smooth and fun.

2-Second Step: Combine Wet Ingredients In a large bowl, cream the 1/2 cup butter (115 g) with 1/2 cup granulated sugar (100 g) and 1/2 cup brown sugar (130 g) for 2-3 minutes until it’s light and fluffy this step is crucial for that airy texture in your chewy monster cookies. Mix in the 1/2 cup peanut butter (110 g) until fully blended, then add the egg and 1 teaspoon vanilla extract (5 ml) to create a glossy base. If you’re aiming for a baked oatmeal cups variation, this is a great point to think about tweaks.

3-Third Step: Add Dry Components In another bowl, whisk together 1 cup all-purpose flour (120 g), 1 1/4 cups oats (112 g), 1/4 teaspoon salt (1.5 g), 1/2 teaspoon baking powder (2 g), and 1/2 teaspoon baking soda (2.5 g) for even distribution. Gradually stir these dry ingredients into the wet mixture until just combined, keeping the dough from getting overworked to maintain that chewy texture. This blend of oats and flour is what gives chewy monster cookies their hearty structure.

4-Fourth Step: Incorporate Mix-Ins and Adjust Texture Fold in the 3/4 cup chocolate chips (130 g) and 1/2 cup candy-coated chocolate pieces (90 g) to add those irresistible bursts of flavor. If the dough feels too dry, add a splash of milk; if it’s too sticky, a bit more flour can help. Chilling the dough for 15-30 minutes is a smart tip to prevent excessive spreading, ensuring your chewy monster cookies stay thick and packed.

5-Fifth Step: Portion the Dough Use a cookie scoop to portion out the dough onto your prepared sheets, spacing them about 2 inches apart. For an extra touch, press a few chocolate chips on top before baking to make your chewy monster cookies look as good as they taste. This step keeps everything uniform and highlights the mix-ins.

6-Sixth Step: Bake Bake at 350°F (175°C) for 10-12 minutes, watching for edges to set while the centers stay soft don’t overbake for that perfect chewy finish. If you’re using frozen dough balls, add 2-4 minutes extra. These chewy monster cookies are ready when they look just set in the middle, allowing them to firm up as they cool. For more ideas on baking with oats, check out similar recipes on sites like Allrecipes for inspiration.

7-Seventh Step: Cool and Finish Let the cookies cool on the sheet for a few minutes before moving them to a rack. This helps them set without getting too crisp, preserving that chewy monster cookies magic. Once cooled, they’re perfect for storing or enjoying right away, with prep time of 15 minutes, cook time of 10 minutes, and total time around 25 minutes plus chilling.