St Patricks Rainbow Bars (Print Version)

Buttery bars with rainbow sprinkles and white chocolate chips for a colorful, festive treat.

# Components:

→ Dry Ingredients

01 - 2 cups all-purpose flour
02 - 1/2 teaspoon baking powder
03 - 1/4 teaspoon salt

→ Wet Ingredients

04 - 3/4 cup unsalted butter, melted and cooled
05 - 1 cup granulated sugar
06 - 1/2 cup light brown sugar, packed
07 - 2 large eggs
08 - 2 teaspoons pure vanilla extract

→ Mix-Ins

09 - 3/4 cup white chocolate chips
10 - 1/2 cup rainbow sprinkles, divided

# Directions:

01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
03 - In a large bowl, whisk melted butter, granulated sugar, and brown sugar until smooth. Add eggs and vanilla extract; whisk until fully combined.
04 - Gradually fold the dry ingredients into the wet ingredients with a spatula, mixing until just combined.
05 - Stir in the white chocolate chips and 1/3 cup of the rainbow sprinkles.
06 - Spread the batter evenly into the prepared pan. Sprinkle the remaining sprinkles over the top.
07 - Bake 25-28 minutes, or until the edges are golden and a toothpick inserted into the center comes out mostly clean.
08 - Cool completely in the pan on a wire rack before slicing into bars.

# Expert Advice:

01 -
  • They bake in under 30 minutes, which means you can go from zero to celebration-ready faster than you'd think possible.
  • One bowl, simple folding, no fancy techniques—just straightforward baking that actually works every single time.
  • The sprinkles stay vibrant and don't bleed into the batter if you do one small thing right (spoiler: timing matters).
02 -
  • If you fold the dry ingredients too aggressively, your bars will taste dense and cake-like instead of tender and buttery—slow down and let the spatula do gentle work.
  • Reserve some sprinkles for the very top; baking sprinkles directly into the batter can cause bleeding and muddy colors, but topping them after spreading keeps them looking bright and festive.
03 -
  • Use parchment paper with overhang—it's the difference between effortless removal and frustrated scraping.
  • Don't open the oven door in the first 20 minutes; the temperature drop can cause uneven baking and sunken centers.
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