30Oreo cookiescoarsely chopped (or 2 cups other mix-in)
1cupM&M'sor small pieces of other candy
Instructions
Preheat oven to 350°F/175°C.
Line a 9x13 baking dish or pan with foil and spray with nonstick cooking spray.
In a large microwave-safe bowl, heat the butter in the microwave until melted.
Remove from microwave and whisk in the sugar and vanilla.
Then add the eggs and mix until smooth.
In a medium bowl, whisk together the flour, baking powder, and salt.
Then add the dry ingredients to the wet and stir until just combined; don't overmix.
With a rubber spatula, fold in the crushed Oreo cookies (or about 2 cups of other crushed cookies or candy).
Scrape the batter into the prepared pan, smoothing the top with the spatula.
Sprinkle the M&M's (or other small pieces of candy) over the top evenly and lightly press them down into the surface of the batter.
Bake for about 30-40 minutes, or until the top is firm, cracked, and golden.
Baking times may vary depending on the mix-ins and the type of pan.
A toothpick inserted into the center should come out clean or have moist crumbs attached, but not gooey batter. Transfer pan to a cooling rack and allow bars to cool in the pan for at least 30 minutes.
Then remove the bars from the pan (by lifting the foil out), cut them into bars, and serve.
Notes
Store in an airtight container at room temperature for up to 5 days, or in the freezer for a few months.