Grease a rectangular pan 9 x 13 with butter and dust it with flour. Set aside.
Preheat oven to 350 degrees F.
In a small bowl, sift together all dry ingredients: flour, baking soda and salt. Set aside
In a large bowl, beat together butter, brown sugar and eggs with an electric mixer until creamy.
Slowly mix dry ingredients into wet ingredients.
Once all ingredients are well-combined, fold in white chocolate chips. Evenly spread cookie bar mixture into greased pan.
Top the cookie bar mixture with candy eggs. Bake for 30 minutes.
Allow cookie bars to cool before decorating. Cut into small squares, about 2in x 2in in size.