Chicken Meatballs all'Arrabbiata with Polenta

Ingredients

• 1.1 pounds ground chicken
• 1 tsp salt
• 1 tsp black pepper
• 1 tsp sweet paprika
• 1 tsp garlic powder
• 1 tsp dried onion
• 1 egg yolk
• 2 tbsp breadcrumbs
• 2 tbsp grated Parmesan
• 1 tbsp olive oil
• 2 tbsp unsalted butter
• 4 garlic cloves (minced)
• 1 small yellow onion (finely chopped)
• 1 tsp Italian seasoning
• 2 tsp chili flakes or chili paste (more or less to taste)
• 3 tbsp double concentrated tomato paste
• ¼ cup chicken broth
• 2 cups puréed tomatoes
• 2 tbsp chopped parsley
• 1 ounce grated Parmesan
• 4 ounces instant polenta
• 1 cup whole milk
• 1 cup chicken broth
• 1 tbsp unsalted butter
• 4 tbsp grated Parmesan