Chocolate cake with condensed milk caramel frosting

Ingredients

• 4 eggs
• 150 grams (5.3 ounces) sugar
• 90 grams (3.2 ounces) neutral vegetable oil
• 180 grams (6.3 ounces) flour
• 45 grams (1.6 ounces) cocoa powder
• 9 grams (1.5 teaspoons) baking powder
• 1/5 teaspoon baking soda
• 180 milliliters (3/4 cup) hot water
• 2 eggs
• 350 grams (12.3 ounces) sour cream (20%)
• Vanilla to taste
• 100 grams (3.5 ounces) sugar
• 25 grams (0.9 ounces) corn starch
• 150 grams (5.3 ounces) butter
• 50 grams (1.8 ounces) caramel (boiled sweetened condensed milk)
• 300 grams (10.6 ounces) cream cheese
• 125 grams (4.4 ounces) caramel (boiled sweetened condensed milk)