On a floured piece of parchment paper in a baking sheet pan, stretch or roll out the dough to about 12 inches in diameter.
Preheat barbecue grill to have all burners on medium-high heat, or direct heat if you are using charcoal
Clean the grill, then use a folded piece of paper towel to carefully grease the grill grates with a small amount of olive oil to help prevent sticking.
Brush the top of the dough with olive oil.
Use the parchment paper to transfer the dough oiled-side down onto the grill, work quickly to stretch the pizza dough into a circle before it sets on the grill.
Cover the grill for 2 minutes, open and check if the bottom of the pizza crust has browned and no longer sticks, the dough may look bubbly.
Flip the dough over and work quickly to add the BBQ sauce, mozzarella, tomato, bell pepper, onion, corn, and cooked chicken.
Cover and cook for 4 to 5 minutes, until the cheese is melted and bubbly.
Check the bottom of the crust halfway through to make sure it doesn't burn too much.
Top pizza with sliced green onions and more barbecue sauce if desired.
Transfer pizza to a cutting board and cut into 8 slices, serve immediately