Double Chocolate Chip Muffins with Salted Caramel Sauce

Ingredients

• 2 cups all-purpose flour
• 1 cup white sugar
• 1/2 cup unsweetened cocoa powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 3/4 cups semi-sweet chocolate chips
• 2 eggs (room temperature)
• 3/4 cup sour cream (room temperature)
• 1/2 cup vegetable oil
• 1/2 cup milk (room temperature)
• 1 1/2 teaspoons vanilla extract
• 6 tablespoons butter (at room temperature and sliced into pieces)
• 1/2 cup heavy cream (at room temperature)
• 1 teaspoon salt