It isn't like she can't cook. She can do anything, except wear those stupid fru-fru dresses Rarity keeps brandishing at her. It's just that ovens tend to have drastic effects on a house made of water vapour. So, that's that. She can cook. She just sort've can't.
So having an eager earth pony friend who happens to cook for a living is a blessing. But sometimes she worries about the price she pays. Reading from a script that Pinkie wrote herself?
"Okay, now put on the Puddinghead hat, and blow the trumpet!" Pinkie giggles.
Actually, she means all the time.
"Pinkie, this is ridiculous," Dash pouts. "I'm not reading this."
She tries to storm out, but it doesn't help when the pony you're storming away from skips along in your wake.
"But Dashie," Pinkie wheedles, "We need to practice for the performance next week."
"Performance? We're performing? In public?" Dash spits.
"Yup, it'll be so much fun! Now, repeat after me. 'I love you, Commander Hurricane!'"
"...Wait, if I'm Puddinghead, then who's-"
"Me, silly! And Fluttershy's Clover the Clever! She just doesn't know it yet!"
Rainbow Dash blanches, and gets the feeling she's in for one heck of a show.