Rinse potatoes and place in a large microwave-safe bowl or dish. Pour 1/3 c. water over the potatoes.
Cover and microwave on high for about 10-12 minutes or until mostly cooked through (a little crunchiness is ok).
When potatoes are done, drain well and return to large bowl (make sure you get any excess water out of the bowl).
Allow potatoes to cool about 10-15 minutes.
While potatoes are cooling, combine melted butter, 2 Tbsp. Parmesan cheese, garlic, seasoning salt, and pepper in a small bowl. set aside.
Pour half of the butter mixture over potatoes and toss until potatoes are well covered. Set remaining butter mixture aside.
Skewer potatoes onto metal skewers or wood skewers that have soaked in water.
Heat grill to medium-high heat.
Place potato skewers on grill and cook about 2-3 minutes on each side or until you can see grill marks. Brush on additional butter mixture while grilling.
Remove from grill and garnish with extra Parmesan cheese and/or fresh, chopped parsley.