Prepare a baking sheet by lining with parchment paper. If you wish, use a ruler and pencil to draw an 8×10 inch rectangle in the center of the parchment paper, then flip the paper over so the pencil lines are touching the baking pan.
Place 12 oz of the white chocolate in a medium sized microwave safe glass bowl. Place the bowl in the microwave, then begin heating up the chocolate incrementally for 30 seconds on HIGH. Stir the chocolate with a spatula and repeat heating in 30 second increments 2-3 more times, stirring between, until the chocolate is mostly melted. Remove from the microwave, add the remaining white chocolate to the bowl and stir constantly until all the chocolate is melted and is smooth.
Spread the chocolate onto the parchment lined baking sheet, using a spatula to spread it into an even layer. Scatter the mini egg candies and let it sit at room temperature until firm, about 2 hours. You can also speed up the process and let it chill in the refrigerator for 20 minutes to harden.