Preheat the oven to 400° F and line a baking sheet with parchment paper.
Slice the potatoes into large rounds about 1/4” thick and place on baking sheet in a single layer. Brush with a tiny bit of olive oil, salt, and pepper. Roast 20-25 minutes, until cooked.
To make the topping, gently stir together the tomato, sweet onion, olive oil, pine nuts, and seasonings in a small bowl.
When the potatoes are cooked, top the rounds with the tomato mixture. Enjoy!