He cooked up some delicious dishes for "Top Chef 3" on Bravo -- but now finalist Brian Malarkey is tackling something bigger: Whipping up the world's biggest Rice Krispie Treat!

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As part of the new TLC series "Mega Bites," Malarkey and a crew of volunteers attempt to create a 10,000lb marshmallowy treat -- a goodie that will be divvied up and sold to benefit the The Community Center of La Canada Flintridge in California.

The sweet show debuts tomorrow on TLC!