Fill a large stock pot halfway with water. Peel the potatoes, cut in half and add to the pot.
Place pot on high heat and boi potatoes until tender. Drain and cool.
While the potatoes cool, make the dressing.
In a small bowl, add mayonnaise, mustards, onion powder, salt and pepper. Stir to combine. Set aside.
Once potatoes are cool enough to handle, cut into 1/2 inch cubes and add to a large bowl.
Dice the hardboiled eggs and add to the potatoes.
Pour dressing over potatoes and eggs. Mix thoroughly. Can be stored in the refrigerator for up to four days.