Preheat the oven to 200C/400F.
In a large mixing bowl combine paprika, oregano, onion powder, garlic powder, pepper and 3/4 tsp salt with 1 1/2 tbsp olive oil until a paste forms (add a dash more oil if needed). Toss in the chicken until evenly coated.
In an 12x9" / 30x22cm baking dish (or similar size) add the baby potatoes alongside the remaining oil and salt + a large pinch of pepper. Toss to combine, then place them all cut-side-down. Add a wire rack on top then add the thighs on top of the wire rack.
Pop in the oven for around 35-40mins, or until the thighs are crispy, lightly charred and piping hot through the centre (timings will depend on the size of the thighs so just be vigilant). Remove the chicken and place on a plate to one side.
Use tongs or a spatula to toss the potatoes in the chicken fat, then crank up the heat to 220C/430F and roast the potatoes until deep golden/lightly charred, tossing once or twice as needed (up to 10mins or so). If you need to roast past 10mins, add the chicken back in for a couple of mins before the potatoes are done, just to crisp them back up.
Season potatoes with more salt if desired then serve up and enjoy. I like to spoon over some of the excess fat over the chicken at the end! (see notes for serving suggestions).