Make the biscuit dough: Start by combining the flour and salt in a bowl then set the bowl aside. To a stand mixing bowl, add the butter and sugar then using a paddle attachment cream them together until light and fluffy. You can also complete this step using a hand mixer.
Mix in the vanilla extract, almond extract and milk then add in the flour and continue to mix until a dough forms. Tip the dough out onto a lightly floured surface and knead until you have a smooth dough. Split the dough into 2 equal pieces then shape both pieces of dough into disk shapes before placing them in the fridge for 1 hour.
Make the Prosecco jam: While the dough is in the fridge, begin to make the Prosecco jam. To a saucepan, add the strawberry jam and Prosecco then place on a medium heat. Bring the mixture to a boil then begin to stir. Let the mixture simmer for around 10 minutes while occasionally stirring. When the jam and Prosecco has thickened and begins to stick to the bottom of the pan, turn of the heat and set the mixture aside. It will thicken further when cooled.
Cut and bake the biscuit dough: Preheat the oven to gas mark 3/325oF/160oC/140oC fan and line a baking tray with parchment paper. Remove one piece of dough from the fridge then roll it out to around ½ cm think and cut circles or flowers using a cutter (around 5cm). Re-roll and cut any scraps. Place the cut biscuit dough onto the baking tray and bake on the middle shelf for around 12 minutes. These will be the base of the biscuits. Remember to set a timer as these biscuits will burn quickly.
While the biscuit bases are baking, roll out the second piece of dough and repeat the process of cutting the shapes. Add the cut biscuits to a lined baking tray and use a smaller cutter (around ¾ - 1 inch) to cut smaller shapes in the middle of the cut biscuits. You can also bake the small cut shapes if you want. Re-roll any scrapes and repeat the process. Bake the tops of the biscuits for 12 minutes. Once all the biscuits are baked allow them to cool for 25 minutes.
Fill the biscuits: Once the biscuits are cooled, filled the bases of the biscuits with 1 teaspoon of the Prosecco jam and cover the jam one of the biscuit tops. Repeat until all the biscuits are filled. Sprinkle with icing sugar if desired then enjoy.