Step 1

Preheat the oven to 350°. Prepare an 8 inch cast-iron skillet with parchment paper.

Step 2

In a small bowl, whisk together the flour, baking powder, and salt.

Step 3

In a mixing bowl, beat together the melted butter and sugars. Add the egg and vanilla, beating until well blended.

Step 4

Add the flour to the sugar mixture and mix until combined.

Step 5

To the batter, stir in ¾ cup of the candies.

Step 6

Press the dough into the prepared skillet.

Step 7

Bake the cookie for 15 to 20 minutes or until the edges are lightly golden brown and the top of the cookie is set. Place the skillet on a wire rack and let it cool for 10 minutes.

Step 8

To melt the chocolate, place the milk chocolate morsels into a microwave-safe bowl. Heat on high for 30 seconds. Stir well and repeat for 15 seconds, stirring after each heating cycle, until the chocolate is melted.

Step 9

Spread the melted chocolate over the cookie and press the remaining M&Ms into the chocolate.

Step 10

Let the cookie pizza rest for 15 to 20 minutes or until the cookie is completely cooled and the chocolate is set.