Preheat the oven to 350 degrees and spray a 9x13 baking pan with non-stick spray.

Prepare the brownies according to the package directions, adding a third egg only if you'd like cake-like brownies.

Bake for 27 minutes or until the brownies test done in the middle.

Allow the brownies to cool completely.

Once the brownies are cool, use the Filled Pastry Bag to pipe chocolate frosting in lines across the top of the brownies.

Use an offset spatula or knife to smooth out the frosting.

Place the brownies in the refrigerator for 15-20 minutes so the frosting can set a little, which will make the brownies easier to cut.

Cut the brownies in rectangles (about 1.5"x 3"). Wipe the knife on a paper towel between each cut to keep the lines smooth and straight.

Place the cut brownies on a flat baking sheet.

Take a toothpick and draw a line to divide the "domino".

Use mini white chocolate chips or marshmallow bits to make the number dots on the dominos.

Enjoy practicing math facts, playing dominos, and especially eating the brownies.

Store any leftovers in an airtight container.