Heat oven to 400°F. Grease 15x10x1-inch baking pan. Unroll dough; place in greased pan. Starting at center, press out dough to edge of pan. Bake at 400°F. for 9 to 13 minutes or until edges are light golden brown.
Meanwhile, cook spinach as directed on package. Drain well; squeeze to remove liquid. Heat oil in small skillet over medium-high heat until hot. Add onion; cook and stir 3 to 4 minutes or until tender, stirring frequently.
Remove partially baked crust from oven. Top crust with spinach, onion, chicken, cheese and bacon.
Return to oven; bake an additional 9 to 12 minutes or until cheese is melted. Cut into squares.