Mix the flour with salt and instant yeast in a large bowl or the bowl of a stand mixer with a dough hook. Add the warm water and olive oil to the flour mixture and mix well until it forms into a dough. Knead for 7 to 10 minutes until the dough is not very sticky anymore.
Place the dough ball in a clean bowl and add 1 tbsp of olive oil. Move the dough around so it's coated with olive oil on all sides. Cover the bowl with plastic wrap and a kitchen towel. Place the bowl in a draft free place such as an off oven or microwave and let it rise for 1 hour, until the dough is doubled in size.
Meanwhile, make the topping by mix the zaatar and olive oil in a small bowl and set it aside.
Preheat the oven to 425°F. Place a pizza stone or a baking sheet on the middle rack in the oven.
Punch the dough knead it for 2 to 3 minutes. Divide the dough into 8 pieces and shape each piece into a ball.
Roll out a piece of dough into 1/2 inch thick. Place it on a parchment paper. Spread a thin layer of the zaatar olive oil mix on top and leave about 1/2 inch margin.
Place the parchment paper on the pizza stone/baking sheet in the oven. Bake for 10 minutes. Repeat this process with the remaining dough pieces.
Keep the manakeesh zaatar under a kitchen towel to stay warm and soft.