Lemon honey mustard chicken

Name: Lemon honey mustard chicken
Ingredients: 650 g chicken thighs, skin off; 600 g potatoes, quartered; 1 tbsp olive oil; 300 g frozen peas; 300 g spinach, trimmed; 1 tbsp wholegrain mustard; 1 tbsp honey; 1 tsp minced garlic; 2 tbsp lemon juice