Melt white baking chips with coconut oil in a microwave-safe bowl for 30 seconds; stir. Heat in 15-second bursts, stirring until smooth.
Stir in vanilla extract until evenly combined.
Fold in chow mein noodles, peanuts, and shredded coconut until everything is well coated.
Scoop heaping tablespoons of the mixture onto the prepared pans to form small haystacks.
Sprinkle tops with sprinkles if using.
Chill pans for 15–20 minutes, or let stand at cool room temperature until set.
Notes
Variation: Swap the peanuts for toasted almonds or cashews, or drizzle set haystacks with a little melted dark chocolate. For a sweet-salty kick, finish with a tiny pinch of flaky salt. Storage: Keep in an airtight container at cool room temperature up to 5 days, refrigerate up to 2 weeks, or freeze up to 1 month.This recipe is an original creation inspired by classic White Chocolate Haystacks Recipe flavors. All ingredient ratios and instructions are independently developed.