Preheat the oven to 400°F.
Combine Brussels sprouts, onion, potatoes, and salami on a parchment-lined baking sheet. Toss with olive oil and season with salt and pepper. Bake in preheated oven for 10 minutes.
Remove pan from oven, add the chopped apple, and stir to combine. Return pan to oven and continue baking for another 10 minutes, or until veggies are tender.
If desired, serve over massaged kale greens topped with toasted walnuts and crumbled feta or goat cheese. Enjoy!