Preheat the oven to 250 degrees F. Line a rimmed baking sheet with parchment paper.
In a small bowl, stir together the buttermilk powder, dried parsley, dried chives, dried dill, dry mustard, cayenne, garlic powder and onion powder. (This is a homemade dry ranch seasoning mix which you could also treat like the packet and stir into sour cream or Greek yogurt for a quick dip!)
In a large bowl, combine the pretzel snaps, Cheddar bunnies, oyster crackers, sriracha peas and white Cheddar balls.
Melt the butter in a small skillet (or the microwave) and stir in the sriracha.
Drizzle the butter mixture over the snack mix and toss with the seasoning mix and Parmesan. Spread on the prepared baking sheet and bake, tossing once or twice, until everything is dry and toasted, about 25 minutes. Let cool on the baking sheet.