I start with the grapes since they take the longest to dry. Melt the white chocolate chips in the microwave in short 20-second bursts, stirring in between, until smooth. Spoon the melted chocolate into a zip-top bag and snip off a tiny corner to make a simple piping tool.
Pipe a small dot of white chocolate onto one side of each grape, then press a mini dark chocolate chip into the center while it's still soft. Let these sit at room temperature until the chocolate has fully set.
While the grapes dry, I move on to the oranges. Using the black edible marker, draw simple triangle eyes, a triangle nose, and a jagged smile on each orange, just like a mini pumpkin face. Keep the design loose and goofy since imperfect faces actually look more charming on the platter.
Let the marker dry for a few minutes before handling the oranges again. This keeps the lines crisp instead of smudging onto your fingers or the serving tray.
Next, I slice each banana in half crosswise so they stand upright like little ghosts. Press two or three mini chocolate chips, pointed side down, into the top of each banana half to form eyes and a mouth.
Work quickly here because bananas start to brown faster than the other fruits. If you're prepping ahead, hold off on this step until closer to serving time for the best color.
Arrange the sliced apples in a loose layer across the base of your platter, then drizzle them with warmed caramel sauce and scatter the chopped peanuts on top. This creates a caramel apple base that holds the rest of the fruit nicely.
Place the eyeball grapes, jack-o'-lantern oranges, and ghost bananas around the platter in small clusters. I like grouping similar "characters" together so the whole tray reads as one spooky scene rather than scattered pieces.