In a food processor add all the ingredients mentioned under marinade except oil. Add very little water if required and blend everything to a fine paste.
While the food processor still running slowly add olive oil at intervals. (Slowly adding oil helps in emulcification )
Pre heat oven to 180 degree.
Heat a griddle pan. Add little oil
Season chicken thighs with salt and pepper. Brown chicken in the hot griddle on both the sides (1-2 minutes on each side)
After browning of chicken is done , in the same pan toss cubed potatoes and bell pepper just to coat any residual oil in the pan.
In a rectangular pan arrang chicken and veggies in a single layer. Spread the sauce. Make sure chicken and veggies are well coated with the sauce.
Bake for 25-30 minutes or till chicken is cooked through.
To roast a little extra just before the baking ends, I have broiled it for 8-10 minutes on high heat.
Before serving squeeze lemon juice generously.