Preheat oven to 200C/400F
Toss cubed potatoes with 2 tbsp olive oil, 1 tsp paprika, salt and pepper, and 1/2 tsp dried thyme. Spread in a single layer on a large baking paper lined sheet pan.
Bake for 20 minutes.
Season chicken thighs with 1/2 tsp paprika, salt and pepper, and 1/2 tsp dried thyme.
Turn potatoes over and add seasoned chicken to the pan keeping everything in a single layer. Bake for and additional 20 minutes.
Toss onions, mushrooms, and peppers/capsicums with garlic, 1/2 tsp paprika, salt and pepper, 1/2 tsp dried thyme, and 1 tbsp olive oil.
Turn potatoes and add seasoned vegetables to the pan keeping everything in a single layer. Bake for a final 20 minutes.