Preheat oven to 350° and line two large baking sheets with parchment paper. Slice cookie dough into 1/4” rounds. Spread cookies about 1” apart on baking sheet and bake according to package instructions. Let cool completely.
Pour each color sanding sugar into a separate shallow bowl. Using scissors, cut marshmallows in half diagonally and divide halved marshmallows between bags. Dip the cut marshmallow ends in sugar.
Dye the frosting green with a couple drops of food coloring. Place a small amount of frosting on the center of each cookie and place an M&M in the center. Arrange marshmallows around the M&M to look like flower petals.
In a medium bowl, combine white chocolate chips, coconut oil and 4 to 5 drops of blue food coloring.
Microwave on 50% power in 30 second intervals until the chocolate has melted. Stir until smooth.
Toss each Oreo cookie in the blue chocolate mixture until fully coated and transfer to the baking sheet. Sprinkle immediately with sanding sugar then stick two candy eyes on top. Let the chocolate set completely before serving, about 10 minutes.
Preheat the oven to 350 degrees. Measure out and combine the dry ingredients in a bowl and set aside. Cream together the butter and sugars until mixed. Add in the egg, vanilla, honey and peanut butter. Blend until smooth. Add in the dry ingredients and mix well. The batter is so thick that you’ll know it’s mixed well when your arm starts to hurt! Using generous rounded tablespoonfuls, place the dough into roughly circular shapes on a baking tray. (You should get 12 exactly.) Bake for 10-12 minutes.
Place sugar, cornstarch, and salt in saucepan, and gradually whisk in coconut milk. Bring mixture to a boil over medium-low heat. Cook 5-10 minutes, or until thickened, whisking constantly. Turn off heat, stir in vanilla, then banana slices.
Line bottom of 11- x 7-inch baking dish with 24 cookies. Spread hot pudding over top, making sure bananas are submerged to prevent browning. Top with remaining 24 cookies, cover with plastic wrap, and cool. Refrigerate until cold. Top with whipped topping (if using).