Place 1/2 cup flour, yeast, and sugar in a mixing bowl. Pour in warm water. Whisk together thoroughly, 2 to 3 minutes. Cover bowl and let sit until mixture gets bubbly, 30 to 60 minutes. Drizzle in olive oil; add salt and 1 cup flour. Mix together until mixture forms a sticky (not wet) dough ball that pulls away from the sides of the bowl. If mixture seems too wet, add a bit more flour.