Combine oil, garlic, salt & pepper Season it to your liking) in a mason jar and allow it to "steep" for 30 minutes to an hour.
Microwave your Steamables or scrubbed potatoes for 3-4 minutes in your microwave.
You want them to be partially cooked, not soft by any means, just not rock hard.
Allow them to cool a bit and then slice into rounds, placing them on a baking sheet as you do.
Slice your onion(s) into halves, thick slices or chunks (all depends on your choice of potato, I used fingerling and red for mine) and do the same.
Brush both potatoes and onions with your garlic oil, and then sprinkle with some additional salt and pepper (you can add smokey Paprika as well if you like).
Grill potatoes and onions, turning once (with tongs or a spatula and (brushing with the oil before you turn) until done.
Remove from grill, brush with more oil and assemble salad by adding in (layering or placing on a platter) the jalapenos, bacon Parmesan and parsley (don't be shy with those...go big!). Drizzle the remaining oil over-top (as much as you might enjoy), sprinkle with seasoning and enjoy warm or at room temperature.