Step 1: Preheat your oven to 350°F (175°C).
Step 2: Line a 9x9-inch baking pan with parchment paper.
Step 3: In a large mixing bowl, combine the softened butter, brown sugar, and granulated sugar. Beat until light and fluffy.
Step 4: Add the eggs, vanilla extract, and butter extract. Mix until well combined.
Step 5: In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add to the wet mixture, stirring until just combined.
Step 6: Gently fold in the sprinkles.
Step 7: Pour the batter into the prepared baking pan and bake for 20-25 minutes.
Step 8: Let cool in the pan for 10 minutes, then transfer to a cooling rack.
Step 9: For the frosting, beat the softened butter, gradually add powdered sugar, vanilla extract, and milk until smooth.
Step 10: Once the blondies are cool, frost them and top with sprinkles.
