01 - Preheat oven to 350°F. Grease and line a 9x13 inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, whisk together flour, baking powder, and salt until evenly blended.
03 - In a large bowl, cream butter and sugar together with a mixer until light and fluffy. Add eggs one at a time, beating well after each. Mix in vanilla extract and almond extract, if using.
04 - Gradually add dry ingredients to the wet mixture, mixing until just combined. Do not overmix.
05 - Spread dough evenly in the prepared pan. Use a spatula to create a smooth surface.
06 - Bake 18–20 minutes, or until the edges are barely golden and the center is set. Do not overbake. Let cool completely in the pan.
07 - Beat butter until creamy. Add powdered sugar, vanilla, and 2 tablespoons milk. Beat until smooth and fluffy; add more milk if needed for spreadable consistency. If desired, divide frosting and tint each portion with pastel food coloring.
08 - Spread frosting evenly over cooled cookie base. Decorate with Easter sprinkles.
09 - Lift bars from the pan using parchment overhang and cut into squares. Serve or store in an airtight container.