First things first—lay out all your ingredients. It makes the process faster and smoother. Plus, it ensures you won’t forget anything crucial.

Start by preheating your oven to 350°F (175°C). This ensures your cookies bake evenly and gives that delightful golden finish.

In a large bowl, combine the softened butter, dark brown sugar, and peanut butter. Use a hand mixer until the mixture is light and fluffy. It’ll take about 2-3 minutes. This step is essential for incorporating air into your mix, which contributes to the cookie’s texture.

Beat in the egg, vanilla extract, and maple syrup until fully combined. This blend will enhance the sweetness and bring in flavor.

In another bowl, whisk together the flour, baking soda, baking powder, sea salt, and chia seeds. This allows for even distribution when you combine the wet and dry mixes.

Slowly, add the dry ingredients to the wet mixture. Stir until just combined. You don’t want to overmix; that can affect the cookie’s chewiness.

Next, gently fold in the old-fashioned rolled oats, chocolate chunks, regular M&M's, and mini M&M's. Make sure everything is evenly distributed.

Using a cookie scoop or tablespoon, drop dough balls onto a lined baking sheet. Make sure to leave space between them as they will spread slightly. Bake in the preheated oven for about 10-12 minutes, until the edges are lightly golden.

Remove your cookies from the oven and let them cool on the baking sheet for 5 minutes before transferring them to a wire rack. This will allow them to firm up a little bit before you can dive in.