Step 1: Prepare the pan and oven. Heat the oven to 415°F (215°C). Line a baking sheet with parchment paper or lightly brush it with oil so the roasted heart potatoes release easily after baking.
Step 2: Slice and cut heart shapes. Peel the potatoes and slice them into rounds about 1/4 inch, or 6 mm, thick. Use a small metal heart cookie cutter to press out as many hearts as possible from each slice. Place the heart pieces into a bowl of cold water as you work so they do not discolor.
Step 3: Parboil the potatoes. Bring 2 quarts of water with 2 teaspoons of table salt to a boil in a large pot. Add the heart shaped potatoes and cook for 4 to 6 minutes, until a knife or fork slides into the center of a piece with slight resistance. The potatoes should be tender at the edges but not falling apart.
Step 4: Drain and steam dry. Drain the potatoes in a colander. Let them sit for about 5 minutes so steam can escape and the surface of each heart dries slightly. This steam dry step helps them roast up crisp instead of steaming on the pan.
Step 5: Mix the marinade. In a large bowl, whisk together the olive oil, kosher salt, black pepper, dried herbs, and the optional paprika and garlic powder. Taste a small parboiled potato and adjust the salt if needed before tossing all of the hearts.
Step 6: Coat the heart potatoes. Add the warm, steam dried heart potatoes to the bowl with the marinade. Gently toss until every piece is evenly coated in oil and seasoning, trying not to break or distort the heart shapes.
Step 7: Arrange on the baking sheet. Spread the coated heart potatoes on the prepared baking sheet in a single layer with a little space between each one. If the pan looks crowded, use a second baking sheet for best crispness.
Step 8: Roast until golden and crisp. Roast the potatoes for 20 to 25 minutes, turning them once halfway through baking. They are ready when the edges are deep golden and crisp and the centers are tender. For even more color, you can broil the pan for 1 to 2 minutes at the end, watching closely so they do not burn.
Step 9: Taste and serve. Taste one heart and add a pinch more salt if needed. Serve the roasted heart potatoes right away as a side for an at home Valentines dinner, as Valentine foods for kids with dips, or as a warm snack on a Valentines party platter.