Lightly coat a 12x17 inch jelly roll pan with vegetable oil, cover completely with parchment paper. Coat parchment paper with powdered sugar, so no paper shows through.
Pour 1/3 cup cold water and gelatin into the bowl of a stand mixer, allow to soften.
In a medium saucepan over medium-high heat, combine sugar, corn syrup, salt and remaining 1/3 cup water. Stir occasionally until syrup registers 238°F on a candy thermometer (soft-ball stage).
Using a whisk attachment and mixer on low, slowly pour hot liquid down the side of your bowl. Gradually increase speed, continuing to whisk until mixture has nearly tripled in size, 8-10 minutes. Add vanilla or peppermint extract, whisking for 15-30 seconds.
Immediately pour mixture onto prepared baking sheet. Smooth with a small offset spatula dipped in hot water. Gently press and spread. Dip spatula in hot water whenever necessary to avoid sticking.
Sprinkle well with powdered sugar. Allow marshmallow to set for at least 3 hours. Use cookie cutters or a pizza wheel to cut out desired shapes and sizes. Store in an airtight container.
Nutritional information is provided as a courtesy and is an estimate only. Nutrition information can vary for a variety of reasons. For the most accurate data, use your preferred nutrition calculator with the actual ingredients you used to make this recipe.
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