Best Mardi Gras King Cake Recipe - How To Make Easy King Cake

Ingredients

• 2 large egg yolks
• 1 c. sour cream
• 1/2 c. (100 g.) granulated sugar
• 4 tbsp. (1/2 stick) unsalted butter, melted
• 1 tsp. finely grated lemon zest
• 3 c. (360 g.) all-purpose flour, plus more for dusting
• 1 tsp. kosher salt
• 1/2 oz. (2 [1/4-oz.] packets) instant yeast
• 1/4 tsp. ground cinnamon
• Pinch of ground nutmeg
• 1 tbsp. canola oil
• 2 tbsp. granulated sugar
• 2 tsp. ground cinnamon
• 1/3 c. unsalted butter, room temperature
• 1 1/2 c. (175 g.) (or more) confectioners' sugar
• 2 tbsp. (or more) whole milk
• 1 tbsp. fresh lemon juice
• 1/4 tsp. pure vanilla extract
• Purple, green, and gold food coloring, for glaze (optional)
• Purple, green, and gold sprinkles or sanding sugar, for decorating (optional)