01 -
Pull out the whole thing with the baking paper, then use a pizza cutter or knife to cut it into squares.
02 -
Leave everything to chill in the pan for at least 20 minutes, or until it’s not warm at all.
03 -
Pop it in your hot oven and bake for about 22-23 minutes. Edges should look golden. Don’t overdo it—the middle should feel slightly set when touched.
04 -
Toss on the rest of the M&Ms and sprinkles so the top’s all colorful before baking.
05 -
Line a glass baking pan (about 23 by 33 cm) with parchment and press in the dough so it’s nice and even.
06 -
Gently stir in about 1/4 of the M&Ms, roughly a tablespoon of sprinkles, and all the mini chocolate chips.
07 -
Mix flour, baking soda, and salt straight into your bowl until you’ve got a soft, smooth dough.
08 -
Crack your egg and pour in vanilla, then stir again ’til everything comes together and’s smooth.
09 -
Mix the melted butter, brown sugar, and white sugar in a big bowl, using a fork ’til it’s really combined.
10 -
Switch your oven on to 165°C with top and bottom heat.