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Very lightly grease a baking sheet with cooking spray or oil and set aside.
In a large glass bowl that will fit into the microwave, stir together the corn syrup, sugar, peanuts and 5-spice powder until thoroughly mixed together.
Microwave on high for 6 minutes.
Stir in the butter and microwave for an additional 30 seconds.
Remove from microwave and gently stir in baking soda until the mixture is light and foamy.
Using a rubber spatula that has been sprayed with cooking spray, scrape the mixture out onto the greased baking sheet.
Smooth out to a thin layer and allow to cool for at least 1 hour.
Once cool, break the brittle into pieces and store in a well-sealed container.