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1
Place an oven rack in the center of the oven.
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2
Preheat the oven to 325 degrees F.
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3
Form the cookie dough into 12 equal-sized balls and place on an ungreased baking sheet.
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4
Bake for 16 to 18 minutes until lightly browned around the edges.
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5
Cool for 10 minutes.
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6
Transfer the cookies to a wire rack to cool completely, about 20 minutes.
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7
In a small bowl, toss together the chocolate chips and oil.
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8
Place the bowl over a pan of simmering water and stir until the chocolate has melted and the mixture is smooth, about 3 to 5 minutes.
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9
Spread the melted chocolate on top of 6 of the cooled cookies.
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10
Place on a parchment or waxed paper-lined baking sheet.
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11
Sprinkle the chocolate-toffee candy pieces on top of the melted chocolate.
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12
Place the remaining cookies, flat-side-up, on the same baking sheet.
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13
Arrange the banana slices in a single layer on the flat side of the remaining cookies.
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14
Freeze all the cookies for 45 to 60 minutes until the chocolate has set and the banana slices are frozen.
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15
Using an ice cream scoop, scoop about 1/3 cup softened ice cream on top of the frozen bananas.
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16
Place a chocolate covered cookie on top and gently press to form a sandwich.
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17
Repeat with the remaining ice cream and cookies.
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18
Freeze for 3 to 4 hours until firm.
