Arrange the apple slices in a single overlapping layer on a large serving platter.
Warm the caramel sauce slightly if needed, then drizzle it evenly over the apple slices.
Melt the white chocolate melting wafers in the microwave in 20-second bursts, stirring between each until smooth.
Spoon the melted white chocolate into a piping bag or zip-top bag with a small corner snipped off, then pipe circles over the apples and drag a toothpick through them to form a cobweb pattern.
Scatter the mini chocolate chips, chopped pecans, and Halloween sprinkles across the top before serving.