STEP ONEHEAT oven to 350°F. Microwave 1/4 cup coconut oil in medium microwave-safe bowl 25 seconds or until melted. Stir in crushed vanilla wafers and 1 tablespoon sugar until evenly moistened. Press into 9-inch pie plate to form a crust. Bake 10 minutes. Cool completely.
STEP TWOWHISK remaining 6 tablespoons sugar, milk, cornstarch and salt in medium saucepan until smooth. Cook and stir over medium-high heat until bubbly. Cook and stir an additional 1 minute. Remove from heat. Whisk egg yolks in small bowl. Add 1/4 cup hot filling to yolks, stirring constantly. Return egg yolk mixture to saucepan. Bring to a simmer over low heat, stirring constantly. Remove from heat. Stir in remaining 1 tablespoon coconut oil and vanilla.
STEP THREEARRANGE bananas in crust. Pour filling over bananas. Arrange wafers over filling. Chill 2 hours or until firm. Beat cream and powdered sugar in large bowl with mixer on high speed until stiff. Spread over top of pie. Garnish with vanilla wafers, as desired.