Preheat your oven to 425 F. While the oven is warming, give your potatoes a good scrub under cold water.
Fill a large pot with salted water and bring it to a boil. Add your potatoes and cook them until they're tender but still hold their shape, about 15-20 minutes depending on their size.
While the potatoes are boiling, grab a small bowl and mix together the smoked paprika, ground cumin, grated garlic, and a pinch of sea salt. Add your chili flakes or powder for heat.
Once your potatoes are cooked, drain them well and transfer them to a large bowl. Drizzle them with the olive oil and sprinkle your spice mix over the top. Toss gently.
Arrange the spiced potatoes on a greased baking sheet, leaving some space between each one. Take a flat-bottomed glass or a small bowl and gently press down on each potato to flatten it. Use a pastry brush to dab any leftover spice mix onto the potatoes. Brush on a little more olive oil if they seem dry.
Slide the baking sheet into the preheated oven and roast for about 45-60 minutes. You're looking for a golden color with a crispy exterior. Watch them from 45 minutes to ensure they don't overcook.
Once they're crisped, remove from the oven. Let them cool for just a moment before serving.