Preheat oven to 350 degrees F. Combine flour, baking powder, sugar, cheese, and scallions. Stir beer in gently to form a thick, sticky batter. Pour batter into greased loaf pan, 8-1/2 x 4-1/2 inches. Brush top of loaf with beaten egg and sprinkle with sesame seeds. Bake in oven for 1-1/4 hours or until loaf browns. Remove from oven and cool on a wire rack.