01 -
Line a square metal 8×8 baking pan with parchment paper, ensuring paper hangs over all sides. Preheat the oven to 375°F/190°C.
02 -
Cream the butter and sugar in a stand mixer bowl for 3 minutes until light and fluffy. Scrape down the bowl.
03 -
Mix in the eggs and vanilla extract until just combined. Scrape down the bowl.
04 -
Mix in the flour, salt, and baking soda until the dough starts to come together.
05 -
Refrigerate the dough for 20 minutes to firm up for easier handling.
06 -
Press half of the cookie dough (approximately 348g) into the prepared pan.
07 -
Remove the first layer from the pan by lifting out one of the parchment papers and transfer it to a baking sheet. Place in freezer temporarily.
08 -
Replace the parchment strips in the pan. Press the remaining cookie dough evenly into the pan.
09 -
Spread the strawberry preserves evenly over the dough layer.
10 -
Place the frozen dough layer on top of the preserves. Remove parchment and press firmly to secure.
11 -
Bake for 25-28 minutes or until the top is golden brown.
12 -
Allow bars to cool completely on a wire cooling rack.
13 -
Remove from pan by pulling parchment sides. Flip upside down so the bottom becomes the top.
14 -
Whisk together powdered sugar, milk, and vanilla extract until smooth.
15 -
Pour glaze over the bars and immediately sprinkle with rainbow sprinkles.
16 -
Allow bars to sit for 1-2 hours at room temperature until glaze sets. Cut into 15 bars and serve.