Preheat the oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan and line it with parchment paper for easy removal of the bars.

1. Mix the dry ingredients: In a medium bowl, whisk together the flour, baking powder, cinnamon, ginger, nutmeg, and salt. Set aside.
2. Cream the butter and sugar: In a large bowl, beat together the granulated sugar and softened butter until light and fluffy, about 3 minutes.
3. Add eggs and vanilla: Beat in the eggs, one at a time, then add the vanilla extract and mix until well combined.
4. Combine the wet and dry ingredients: Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk, starting and ending with the dry ingredients. Mix until just combined, being careful not to overmix.
5. Bake the cake: Pour the batter into the prepared baking pan and spread it evenly. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Allow the cake to cool completely in the pan.
6. For the frosting: Whip the cream: In a chilled mixing bowl, beat the heavy cream and powdered sugar together on medium-high speed until stiff peaks form. Add the vanilla extract and continue to whip until fully incorporated and fluffy.
7. Spread the frosting: Once the spice cake has cooled, spread a generous layer of the whipped cream frosting over the top. You can use a spatula to smooth it evenly or create a more textured, snowy effect.
8. Add coconut flakes: For an extra ‘snowy’ look, sprinkle the coconut flakes over the frosting to give it a wintery, snowy feel (optional but fun!).
9. For decoration: Top with Peeps: Gently press the Peeps into the frosting, arranging them however you’d like for a colorful, fun decoration. You can use one Peeps per slice or create a Peeps ‘scene’ on top of the cake bars.
10. Chill: Let the bars sit for 30 minutes to allow the frosting to set slightly and make it easier to slice.
11. Serve: Slice into squares and serve. Enjoy the sweet, spiced goodness of these fun cake bars!