Boosts in chef duels

Nls

So I lost a chef duel and on the screen where the scores are shown and the winner is declared...the winner had two boosts. I am always only able to use one during a battle yet my opponent used both the tasting spoon and the fast feet. Is this possible??

phaedrus

You can open up additional slots for 25 gold

Nls

I was wondering if that was it.. Didn't want to spend the gold without knowing for sure. Thank you !