Chocolate Mousse Cake

INGREDIENTS

• For the Cake:
• 1 cup all-purpose flour
• 1/3 cup dark cocoa powder
• ¾ tsp. baking soda
• 1 ½ tsp. baking powder
• ½ tsp. salt
• 1 Tb. instant coffee granules
• 1 cup granulated sugar
• 1 egg + 1 yolk
• ¾ cup whole milk
• ¼ cup veg. oil
• 1 tsp. vanilla extract
• For the Mousse:
• 5 cups heavy cream
• 13 egg yolks, divided
• 12 Tb. granulated sugar, divided
• 5 Tb. corn syrup, divided
• 4 Tb. water, divided
• 2 Tb. instant coffee granules
• 11 oz. dark (bittersweet) chocolate chips, melted
• 11 oz. milk chocolate chips, melted
• 2 pinches salt
• 3 tsp. vanilla extract, divided