You must use a STAND-style mixer for this recipe (KitchenAid, Sunbeam, etc.) - and also have access to a candy thermometer. Note: It's also best to avoid making these on a very humid or rainy day, as it can affect the setting time.
INGREDIENTS:
2 envelopes of Knox plain (unflavored) gelatin
1/2 cup of water
1-1/3 cups granulated sugar
1/2 cup plus 2 Tbsp. of light Karo corn syrup
1/3 cup water
1/4 tsp. salt
1 tsp. mint extract
1 tsp vanilla extract
1/4 cup powdered sugar
1/4 cup corn starch
DIRECTIONS:
Before starting, prepare an 8x8 cake pan by spraying the sides and bottom of pan with Pam (or other vegetable oil spray.) Next, cover the bottom with a piece of parchment paper* that has been cut to size and also sprayed with Pam. (You may also dust lightly with corn starch or powdered sugar.) Cut an additional piece of parchment that matches the size of the pan and set that aside.
In the large mixing bowl of a stand mixer, pour in 1/2 cup of cool water and sprinkle two envelopes of unflavored powdered gelatin on top of it. Let stand for a few minutes to "bloom."
In a stovetop saucepan add 1-1/3 cups granulated sugar, 1/2 cup plus 2 tablespoons of light Karo corn syrup, and 1/3 cup of water. Stir to combine and bring to a boil over medium-high heat. Boil gently for 5 minutes while stirring constantly (or until temp. reaches 240 degrees F on a candy thermometer.) Remove from heat.
Using the whisk attachment, start mixer on low and combine the gelatin and water. With mixer still on low, slowly pour the stream of hot sugar syrup into the gelatin mixture, being careful not to pour syrup directly onto the beater. After completely combined, beat on low for a few minutes and then turn beater to medium-high. Once mixture starts to fluff up (after a few minutes) add 1/4 tsp. salt and the flavoring extracts. Continue beating until fluffy, stiff peaks form - approximately 8 to 10 minutes. If the peaks are still too soft or runny - beat a few minutes longer until they hold their shape.
Pour mixture into prepared pan, smoothing evenly as best you can. Spray the additional piece of parchment paper that has been cut to size with Pam (or other vegetable oil spray) and place gently on top of the marshmallow mixture. Set pan in a cool, dry place and allow to set at least 4 hours or overnight.
Once set (they will feel dry and springy to the touch) remove the top parchment paper and invert pan on a large platter or cookie sheet. Peel off bottom piece off parchment paper. Into a small bowl sift 1/4 cup cornstarch and 1/4 cup powdered sugar. Using a clean large scissors, cut the marshmallow square into even 1-inch (approx.) strips, and then cut each strip into 1-inch squares. Dust each square in the powdered sugar/cornstarch mixture and shake off any excess. Place on a clean cookie sheet until ready to package or store. These keep very well in a covered, air tight container for several weeks.
*Waxed paper will work as well.
Craft suggestion: Place 6 or 8 in a cellophane treat bag and tie with ribbon or twine to give as party favors or as part of a hostess gift with hot cocoa mix.