Take the whole, unpeeled potatoes to a preheated oven at 200C for 1-2 hours or until really soft and well cooked.
As soon as they are cool enough to handle pass the inside of the potatoes through a potato press or sieve.
Place the mashed potatoes in a pot on medium-low heat and add the butter and milk and adjust with more milk if necessary until you get the consistency you like. Season with salt and pepper.
Mix the paprika with the olive oil. Rub it into the chicken pieces to cover. Season with salt and pepper.
Seal on both sides on a pan with olive oil on high heat. Remember not to move around the chicken too much so it can get golden.
Take to a preheated oven at 180C for 15-20min or until the pieces reaches 73C at the center. The idea is to not dry them out.
Cook the onion on the same pan as the chicken with a bit of olive oil on medium-low heat until it's really soft and translucent.
Add the garlic and cook for a minute.
Add the roasted pepper and cook for a couple minutes until everything is nice and hot.
Season with salt and pepper and blend or process.