Start by brushing each sausage lightly with olive oil so the seasoning has something to cling to. Sprinkle on the paprika, garlic powder, and black pepper evenly across all sides. Let them sit for a few minutes while you prep the other ingredients, so the flavors have time to settle in.
Toss your cut potatoes in olive oil, paprika, and salt until every piece is coated. Spread them in a single layer on a baking sheet so they crisp instead of steam. Bake at 425°F, flipping halfway through, until they turn golden and crunchy on the edges.
While the fries bake, combine your chopped boiled eggs with halved cherry tomatoes in a mixing bowl. Add the mayonnaise, mustard, and chopped green onions, then stir gently so the eggs stay somewhat chunky. Season with salt and pepper, tasting as you go to get the balance right.
Heat your grill or grill pan over medium heat and place the seasoned sausages on it. Turn them every few minutes so they develop char marks on all sides without burning. Cook until they're heated through and nicely caramelized, which usually takes about ten minutes total.
Arrange the grilled sausages alongside a generous scoop of crispy fries and a spoonful of the creamy egg salad. Sprinkle chopped parsley over the top for a fresh pop of color. Serve everything while it's still warm so the contrast between hot fries and cool egg salad really shines.