Instructions
1-Preheat oven to 350°F / 177°C: Preheat oven to 350°F / 177°C. Line an 8×8 metal baking pan with parchment paper and / or spray the pan with nonstick cooking spray.
2-In a medium mixing bowl, whisk together: In a medium mixing bowl, whisk together the flour, baking powder, ground cinnamon, and salt. Set aside.
3-In a larger mixing bowl, whisk together: In a larger mixing bowl, whisk together melted butter and brown sugar until evenly combined. Whisk in egg and vanilla.
4-Pour dry ingredients over wet and stir: Pour dry ingredients over wet and stir with a spatula or wooden spoon just until no dry spots remain (do not overmix.)
5-Gently stir in oats, chocolate chips, and: Gently stir in oats, chocolate chips, and M&Ms.
6-Pour batter into prepared pan, scattering any: Pour batter into prepared pan, scattering any reserved mix-ins over top.
7-Bake 24 to 28 minutes, until the: Bake 24 to 28 minutes, until the edges are lightly browned. (Note: If cooked on the lower end of the bake time, these will be very soft and will stay moist for a couple of days. If you plan to serve them the same day as they were baked, bake at the higher end of the recommended cook time.)
8-Let cool in the pan until the: Let cool in the pan until the bars can be easily removed. Once cool, slice and serve.
9-The bars can be stored at room: The bars can be stored at room temperature for up to 3 days.