Oven-Baked Chicken and Potatoes with Lemon-Mustard Sauce

Ingredients

• 5-6 bone-in, skin-on chicken thighs
• 1 tsp kosher salt
• Black pepper, to taste
• 2 yellow potatoes, cut into 1-inch pieces
• 1 red bell pepper, cut into 1-inch pieces
• 1 medium leek, halved and cut into 1-inch pieces
• Juice and zest of 1 lemon
• 1 1/2 tbsp yellow mustard
• 1 garlic clove, finely chopped
• 2 sprigs rosemary, finely chopped
• 1 tsp smoked paprika
• 1/4 cup olive oil