For the pink prosecco cake: Preheat the oven to 350 degrees F. Grease two 10-inch round cake pans with nonstick baking spray and line with parchment paper.
Whisk the flour, baking powder and salt in a large bowl.
Combine the butter and sugar in a stand mixer fitted with the paddle attachment until light and fluffy, at least 5 minutes. (Don't skip this step!)
Add the eggs, one at a time, waiting until each one is completely combined before adding the next. Stir in the vanilla, red food coloring, milk, prosecco and raspberry liqueur. Stir in the flour mixture with a wooden spoon until just combined.
Pour the batter into the prepared pans. Bake until golden and the cake slightly pulls away from the sides, 30 to 35 minutes. Cool the cakes in their pans for 10 minutes, then flip them onto a wire rack to cool completely.
For the chocolate truffle frosting: While the cakes bake, heat the heavy cream in a medium saucepan until bubbles begin to form. Remove the saucepan from the heat and whisk in the chocolate chips and salt until the chocolate melts and the mixture is smooth. Let cool to room temperature.
To assemble the cake: Place one cake layer on a serving dish or cake stand. Spread the raspberry jam on top of the cake. Put a generous spoonful of the chocolate frosting on top and spread it to the edges. Put the cake in the refrigerator to set. Once set, add the second cake layer and finish frosting the sides and top of the cake with the remaining chocolate frosting. Decorate as desired.