1. Preheat the oven to 350°F and line a 9×13-inch baking pan with parchment paper or grease it lightly.

2. In a large bowl, beat the softened butter, brown sugar, and granulated sugar until light and creamy.

3. Add the eggs one at a time, then mix in the vanilla extract until fully combined.

4. In a separate bowl, whisk together the flour, baking powder, and salt.

5. Gradually add the dry ingredients to the wet ingredients and mix until a thick dough forms.

6. Fold in most of the chocolate Easter eggs and white chocolate chips, saving a small handful of Easter eggs for the top.

7. Press the dough evenly into the prepared pan and scatter the reserved Easter eggs over the top.

8. Bake for 24 to 28 minutes, until the edges are lightly golden and the center is just set.

9. Let the bars cool completely before slicing and serving.