Preheat your oven to 350°F. Grease two 8" round cake pans., In a medium-sized mixing bowl, beat together the butter and sugar until well combined and smooth., Beat in the eggs one at a time, scraping the bottom and sides of the bowl after each addition., Add the extracts, if you're using them., Add the flour, beating gently just until well combined., Divide the stiff batter evenly between the cake pans; there'll be 15 ounces of batter in each., Bake the cakes for about 22 to 26 minutes, or until they start to pull away from the edges of the pans. Remove them from the oven, cool for a couple of minutes, and turn out of the pans onto a rack to cool completely., When the cakes are cool, place one layer on a plate. Spread with the jam of your choice., Whip the cream — 2/3 cup cream makes a medium-thickness layer of filling; 3/4 cup cream, a thick layer. Sprinkle in 2 tablespoons granulated sugar, or to taste, as you whip the cream until it's quite stiff. Stir in the vanilla at the end., Spread the whipped cream over the jam. Top with the second layer of cake., Brush the top of the cake with syrup, and sprinkle with coarse white sparkling sugar, if desired. Or sprinkle with confectioners' sugar just before serving., Refrigerate the cake until you're ready to serve it. It'll be at its best within 12 hours; but is still quite good up to 2 or even 3 days later. The difference will be the whipped cream, which will gradually settle/compact.