Heat oven to 400°F for dark or nonstick pan, 425°F for all other pans. Spray 15x10-inch pan with sides with cooking spray. Unroll dough in pan; starting at center, press dough into 15x10-inch rectangle. Sprinkle evenly with sesame seed, flaxseed and 4 tablespoons of the pepitas. Gently press seeds into dough.