Using a tablespoon or a small cookie scoop, drop heaping spoonfuls of the mixture onto the foil-lined baking sheet, leaving a little space between each cluster. The chocolate will pool slightly at the edges, which helps hold the clusters together once set.
Immediately press a few of the reserved pastel candy-coated chocolates onto the tops of each cluster to create a bright, speckled look. Work fairly quickly so the candies adhere before the chocolate begins to firm up.
Let the clusters sit at cool room temperature until completely set, 1 to 2 hours depending on your kitchen temperature. For faster setting, you can transfer the baking sheet to the refrigerator for about 30 minutes, but avoid prolonged chilling to prevent condensation later.
Once the clusters are firm and the chocolate is no longer tacky, gently peel them off the foil and transfer to an airtight container. Store at cool room temperature for up to 5 days, layering with parchment or wax paper if stacking.
For a slightly less sweet version, use a mix of 1 1/2 pounds white chocolate and 1/2 pound vanilla-flavored almond bark, which sets a bit firmer and balances the sugar. You can also swap in pretzel sticks broken into 1/2-inch pieces if that’s what you have on hand; the key is to keep the pieces small enough to scoop easily. If you want a more pronounced spring look, choose all pastel-coated chocolates and avoid darker colors, or sprinkle a tiny pinch of pastel sanding sugar over the tops right after scooping. For a touch of sophistication, stir in a small handful of toasted sliced almonds or chopped roasted peanuts—but keep the total add-ins the same so the chocolate still binds everything together. If your kitchen runs warm, set the finished clusters on a tray and chill briefly before serving so they keep that glossy look without softening. Finally, if you don’t have a WARM setting on your slow cooker, turn it off as soon as the chocolate is melted and leave the lid slightly ajar; the residual heat will keep the chocolate workable long enough to stir in the pretzels and candies and scoop your clusters.
