Preheat oven to 350 degrees F. Coat a 95-inch loaf pan with nonstick cooking spray.
In a bowl combine flour, baking powder, rosemary, sugar, and salt.
In a bowl whisk together milk, eggs, olive oil, and garlic. Add flour mixture to egg mixture. Stir to combine. (Dough will be wet.) Using a spatula dusted with flour, transfer dough to prepared pan. Press rosemary sprigs on top; sprinkle with sea salt flakes. Bake 40 to 45 minutes or until golden and a toothpick inserted near center comes out clean. Let cool 10 minutes. Remove from pan; cool.