Spiced Apple Sheet Cake with Brown Sugar Cinnamon Buttercream - Sprinkles & Sea Salt

Ingredients

• 1/2 cup coconut oil
• 1 cup dark brown sugar
• 3 large eggs, room temperature
• 1 tsp vanilla extract
• 1 cup sour cream
• 3 cups + 1 tbsp all-purpose flour, divided
• 1 tsp baking soda
• 2 tbsp ground cinnamon
• 1 tsp ground ginger
• 1/2 tsp ground nutmeg
• 1/2 tsp ground cloves
• 1 tsp salt
• 4 cups chopped and peeled hard apples*
• 2 sticks (1 cup) unsalted butter, room temperature
• 2 tbsp cinnamon
• 4 cups powdered sugar, sifted
• 3 tbsp heavy cream
• 1/4 cup pecans (optional for garnish)