Put him down in the playpen and have someone else look after him while you whip up dinner. Be sure to position your child away from the stove. If they're in a high-chair, move it toward an empty wall so they can't reach for the flames on the stove or hot pans. Dishwashers produce scalding vapors that can harm a child if they are placed on the counter directly above the dishwasher. Throughout the house, check for hidden outlets that need to be covered up.
Small fingers can find their way into live outlets easily resulting in nasty burns.
Make sure the crib is positioned away from any live wires or electrical cords. Kids will chew on anything and a cord makes a dandy teething tool. Halogen lamps have gained a nasty reputation for being fire starters. Recent safety regulations have made them safer but you should still check to make sure they all have a metal mesh screen. The bulbs burns extremely hot and can produce serious burns.