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Spread the dulce de leche all over the chilled crust.
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Mix the powdered sugar, brown sugar and cream cheese with a mixer until smooth.
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Add the heavy whipping cream and mix until combined (careful to start slow so it doesn't splatter).
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Mix until the cream mixture is like frosting, thick, set aside.
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Slice the bananas and place them over the dulce de leche in the crust.
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Sprinkle about 1/2 cup toffee bits over the bananas.
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Spread the whipped cream frosting over the bananas and toffee, covering the bananas completely.
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Sprinkle the top of the pie with the remaining toffee bits.
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Chill for 3-4 hours before serving and up to 8 hours.