Add the sliced potatoes into the crockpot. Pour the chicken stock over them and toss together. Set it aside.

In a measuring cup or bowl, add olive oil, minced garlic and red chili pepper, the zest of 1 lemon, the juice of both lemons, garlic powder, Italian seasoning, paprika, oregano, tomato paste, 1 tsp salt, and 1 tsp black pepper. Whisk until combined. Pour half of the marinade over the potatoes and toss until incorporated.

Place the chicken breasts over the potatoes and sprinkle ? tsp of salt and ? tsp of pepper over the chicken. Pour the remaining marinade evenly over the chicken and smooth it out.

Cover the crockpot and cook on high for 4 ? 5 hours or low for 6 ? 8 hours.