Step 1

To make the flour safe to eat, spread it out onto a baking sheet and bake at 350 degrees F for 5 minutes.

Step 2

Line an 8"x8" square pan with parchment paper or foil. Coat the parchment paper with cooking spray.

Step 3

For the cookie dough: Place the butter and brown sugar in the bowl of a mixer and beat until fluffy.

Step 4

Add the vanilla and beat for one more minute.

Step 5

Alternate between adding the flour and condensed milk, mixing on low speed until everything is combined and a dough forms.

Step 6

Stir the chocolate chips and M&M's into the dough.

Step 7

Spread the dough in an even layer in the prepared pan.

Step 8

Place the bars in the freezer for 30 minutes.

Step 9

To prepare the topping: Place the chocolate chips and butter in a bowl and microwave in 30 second increments until melted. Stir until smooth.

Step 10

Spread the chocolate evenly over the cookie dough layer. Press the M&M's into the chocolate.

Step 11

Chill the bars in the fridge for at least 2 hours. Keep chilled until ready to serve, then cut into squares and enjoy. Store any leftovers in the fridge.