1. Preheat the oven to 350°F (180°C). Line a baking sheet with baking parchment and set aside.

2. Add the margarine (or butter) and both sugars to a large bowl and mix until very light and fluffy. Add the egg and mix until well combined. Next, add the peanut butter and vanilla extract and mix in. In a separate bowl mix the flour with porridge oats, rolled oats, baking powder, and salt. Add to the large bowl and mix until just combined – do not overmix! Add the chocolate chips and M&M’s and fold in. Let the dough sit for 5 minutes.

3. Use a large cookie scoop* and place dough portions on the prepared baking sheet. Flatten the dough portions – the dough is not spreading a lot. I could place eight cookies on the baking sheet. Bake the cookies for about 15-16 minutes. Take the cookies out of the oven and let them cool down for some time on the baking sheet, then transfer them to a wire rack – let them cool down completely. Repeat the process with the remaining dough to bake more cookies.