Saute spinach first. In a medium pot over medium heat add spinach, oil, garlic, salt & black pepper. Saute for a few minutes until spinach has wilted. Allow to cool.NOTE: you can try bell pepper and onions or any veggie, just saute them like the spinach.
Roll out pizza dough with a rolling pin on a piece of parchment paper cut bigger than the rolled out dough. Move parchment and dough onto a large sheet pan.
Pour alfredo sauce all over rolled out dough. Spread evenly using a pastry brush. Sprinkle mozzarella cheese all over the alfredo sauce evenly. Top with cooked diced chicken. Place sauted spinach all over the chicken. Top with diced tomatoes.
Bake in 400 degree preheated oven for 16-18 minutes until dough is cooked through & golden brown, and cheese has melted. Remove flatbread from sheet pan and place on work surface or large cutting board. Slice into pieces for everyone to enjoy.