Heat oven to 400°F. Spray cookie sheet with cooking spray. Unroll dough; press to 14x10-inch rectangle. Cut lengthwise in half. Cut into 1-inch strips, making 28 strips. Twist each strip into a knot.
In microwavable bowl, stir baking soda and water. Microwave uncovered on High 1 to 2 minutes or until hot. Brush knots with baking soda mixture. Let stand 5 minutes.
In small bowl, mix seeds, onion and salt. Brush knots with egg; sprinkle with seed mixture. Place knots 1/2 inch apart on cookie sheet.
Bake 7 to 9 minutes or deep golden brown. Cool 2 minutes. Serve pretzel knots warm.