Poppy cake with berry filling

Ingredients

• 3 eggs
• 120 grams (4.2 ounces) flour
• 30 grams (1 ounce) poppy seeds
• 100 grams (3.5 ounces) sugar
• 1 teaspoon (4 grams) baking powder
• 500 grams (17.6 ounces) cream cheese
• 60 milliliters (2 fluid ounces) milk
• 100 grams (3.5 ounces) white chocolate
• 50 grams (1.8 ounces) powdered sugar
• 200 grams (7 ounces) blueberries
• 50 grams (1.8 ounces) sugar
• 1 teaspoon (4 grams) cornstarch