2 cups (304 grams) semolina flour1 teaspoon (3 grams) kosher salt½ teaspoon (2.5 grams) baking powder½ teaspoon (2.5 grams) baking soda½ teaspoon (1 gram) ground cinnamon1 cup (240 grams) whole milk¾ cup (150 grams) granulated sugar½ cup (120 grams) plain whole Greek yogurt2 teaspoons (8 grams) vanilla extractCinnamon Simple Syrup (recipe follows)Crème Diplomate (recipe follows)Garnish: ground cinnamon
Spray a 13×9-inch baking pan with baking spray with flour.
In a large bowl, whisk together semolina, salt, baking powder, baking soda, and cinnamon.
In a medium bowl, whisk together milk, sugar, yogurt, and vanilla. Add milk mixture to semolina mixture, and whisk until well combined. Spread batter into prepared pan. Cover and refrigerate for 30 minutes.
Preheat oven to 350°F (180°C).
Bake, uncovered, until a wooden pick inserted in center comes out clean and an instant-read thermometer inserted in center registers 205°F (96°C), 18 to 25 minutes. Immediately spoon Cinnamon Simple Syrup evenly onto hot cake. Let cool completely in pan on a wire rack.
Spread Crème Diplomate onto cooled cake. Cover and refrigerate for at least 4 hours before serving or up to overnight. Just before serving, garnish with cinnamon, if desired. Cover and refrigerate for up to 3 days.