Toast the sourdough slices until exceptionally crisp and deeply browned, nearly reaching a charred appearance. This creates a firm, flavorful foundation for the toppings.
Spread approximately ⅓ cup cottage cheese evenly over each piece of toasted sourdough.
Drizzle the cottage cheese with hot honey to introduce a balance of sweetness and gentle heat.
Scatter everything bagel seasoning generously over the cottage cheese.
Divide the arugula between the two slices, arranging a handful over each layer of seasoned cottage cheese.
Place the smoked salmon over the arugula, distributing the 2–3 ounces between the prepared toasts.
Add another light sprinkling of everything bagel seasoning over the salmon, if desired.
Finish each toast with quick-pickled onions for a bright, tangy crunch. Serve immediately.