Chocolate mousse cake with banana ganache

Ingredients

• 4 eggs
• 150 grams (5.3 ounces) sugar
• 80 milliliters (2.7 ounces) milk
• 80 grams (2.8 ounces) vegetable oil
• 150 grams (5.3 ounces) flour
• 50 grams (1.8 ounces) cocoa powder
• 10 grams (0.35 ounces) baking powder
• 100 grams (3.5 ounces) heavy cream 33%
• 110 grams (3.9 ounces) cream 20%
• 120 grams (4.2 ounces) milk chocolate
• 5 grams (0.18 ounces) gelatin
• 30 grams (1.1 ounces) water (for gelatin)
• 90 grams (3.2 ounces) bitter chocolate
• 90 grams (3.2 ounces) heavy cream 33%
• 60 grams (2.1 ounces) banana puree
• 15 grams (0.5 ounces) butter
• Pinch of salt
• 120 grams (4.2 ounces) sugar
• 50 grams (1.8 ounces) butter
• 2 bananas
• 400 grams (14.1 ounces) cream cheese
• 80 grams (2.8 ounces) heavy cream 33%
• 50 grams (1.8 ounces) powdered sugar