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1
Heat oven to 325F Line a large baking sheet with foil and coat it with cooking spray or brush it with oil.
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2
In a small saucepan over medium heat, combine sugar and butter.
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3
Cook, stirring constantly, until mixture is melted and bubbling, 1-2 minutes.
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4
Transfer mixture to a medium bowl.
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5
Add oats, walnuts, cocoa, baking powder and vanilla, then stir to combine.
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6
Set aside.
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7
In a small bowl, use a fork to beat egg white until it is slightly frothy.
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8
Measure out 1 tablespoons of the beaten egg white and stir it into the cookie batter; discard remaining egg white or reserve for another use.
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9
Drop half tablespoonful of the batter about 2-inches apart on the prepared baking sheet to make 12 cookies.
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10
Bake 8-12 minutes or until cookies look dry and are just beginning to color on top.
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11
Slide sheet of foil and cookies off baking sheet and onto a flat surface.
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12
Let cookies cool completely.
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13
Peel cookies off foil.
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14
To assemble sandwiches, set a cookie in the center of a dessert plate.
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15
Top with 1/4 cup of the ice cream, set a second cookie on top of the ice cream, then top that with another 1/4 cup of the ice cream.
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16
Set a third cookie on top.
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17
As you assemble the sandwiches, place them in the freezer until ready to serve.