Directions

1. In a small bowl combine the warm water, yeast, 3 Tbsp. of the olive oil, and 1 tsp. sugar. Let stand 5 minutes or until bubbly. In a large bowl combine 3 cups of the flour and 1 tsp. of the salt. Add yeast mixture to flour mixture. Stir until combined. If necessary, stir in enough of the remaining flour to make a dough. Turn out onto a lightly-floured surface and knead in enough of the remaining flour to make a soft dough that is nearly smooth but still slightly sticky (about 3 minutes). Place dough in a lightly oiled bowl, turning once. Cover. Let rise in a warm place until double in size (1 to 1-1/2 hours).
2. Preheat oven to 425 degrees F. Line a 15x10x1-inch baking pan with parchment paper; lightly oil paper. Turn dough into prepared pan and gently press evenly into the pan. Loosely cover; let stand in a warm place while halving, pitting, and slicing peaches.
3. Arrange peaches and blueberries atop dough in pan. Sprinkle with 3 tbsp. sugar and the remaining 1 tsp. salt. In a small bowl stir together remaining 1 tbsp. olive oil and the vanilla. Drizzle over focaccia.