01 - Preheat oven to 350°F. Grease a 9x13 inch baking pan and line with parchment paper, allowing overhang on sides for easy removal.
02 - In a medium bowl, whisk together flour, baking powder, and salt until well blended.
03 - In a large bowl, beat softened butter and granulated sugar with electric mixer until light and fluffy, approximately 3-4 minutes.
04 - Add eggs one at a time, beating thoroughly after each addition. Mix in vanilla extract and almond extract if using.
05 - Gradually add dry ingredients to wet mixture, mixing on low speed until just combined. Avoid overmixing to maintain tenderness.
06 - Press dough evenly into prepared pan using an offset spatula, creating a smooth, level surface.
07 - Bake for 18-20 minutes until edges are lightly golden and center is set. Remove from oven and cool completely in pan.
08 - Beat butter until creamy. Add powdered sugar, vanilla, and 2 tablespoons milk. Beat until smooth and fluffy, adding additional milk as needed for spreadable consistency.
09 - Divide frosting into portions and tint each with pastel food coloring if desired, mixing thoroughly to achieve uniform color.
10 - Spread frosting evenly over completely cooled cookie base. Sprinkle with Easter decorations immediately while frosting is moist.
11 - Lift bars from pan using parchment paper overhang. Cut into 16 equal squares and serve or store in airtight container.