Preheat your oven to 180°C (gas mark 4, 350°F) and line a baking tray with parchment paper.
Place butter and sugar into a large mixing bowl and whisk together until light and fluffy.
Add boiling water, syrup and vanilla extract into the mixing bowl and whisk until combined.
Then add flour, baking powder and oats into the mixing bowl and whisk together until a biscuit batter has formed.
Scoop a teaspoon amount of dough, place it into the palms of your hands and roll the dough into a ball. Place onto a lined baking tray and gently flatten with your hands.
Bake the biscuits in the oven for 15 minutes to 20 minutes or until golden. Once baked, leave the biscuits to cool down.
Whilst the biscuits are cooling, it’s time to make the buttercream. Add icing sugar, butter and vanilla extract into a mixing bowl and whisk together until a light buttercream is made.
When cool, assemble the gypsy creams! Sandwich the biscuits with buttercream and enjoy.