Patriotic Poke Cake | America's Test Kitchen

Ingredients

• 1 cup whole milk , room temperature
• 6 large egg whites , room temperature
• 2 teaspoons vanilla extract
• 2 1/4 cups (9 ounces/255 grams) cake flour
• 1 3/4 cups (12¼ ounces/347 grams) granulated sugar
• 4 teaspoons baking powder
• 1 teaspoon table salt
• 12 tablespoons unsalted butter , cut into 12 pieces and softened but still cool
• 5 ounces (142 grams/1 cup) blueberries
• 1 1/4 cups water , divided
• 1/4 cup (1¾ ounces/50 grams) sugar , divided
• 2 tablespoons berry-flavored gelatin
• 7 1/2 ounces (213 grams/1½ cups) strawberries , hulled
• 1 tablespoon strawberry-flavored gelatin
• 2 cups heavy cream , chilled
• 2 teaspoons granulated sugar
• 1 teaspoon vanilla extract