Prepare the gingerbread batter by combining dry ingredients.
Cream butter and brown sugar until light and fluffy.
Mix in the eggs, molasses, and vanilla extract.
Gradually add dry ingredients to the wet mixture.
Pour the batter into a prepared baking pan.
Bake until a toothpick comes out clean.
Let the gingerbread cool before cutting it into pieces.
Prepare the whipped cream by mixing it with powdered sugar.
Layer the trifle by alternating gingerbread and whipped cream.
Top with crushed gingersnap cookies and mint leaves.
Chill before serving to allow flavors to meld.