Cube and weigh out your 225 grams Butter and leave to soften. A smaller surface area will soften quicker and be easier to mix with. I like to cut them about 1cm, ⅓″ size. If youare in a hurry, or forget to take it out on time, here’s a hack I tried. Soften Butter In About 12 Minutes. Add the 225 grams Castor Sugar & soft butter to a mixing bowl & ‘cream’ together till combined, lighter in colour and texture, and spreadable.
Next add in the 4 Eggs , one at a time, mixing in-between eachaddition. Don’t worry if the batter looks curdled, it will bake fine. Now mix in the 1 tsp Vanilla Extract just till combined.
Sieve over the 225 grams Plain Flour (and 4 tsp Baking Powder if using Plain/A.P.flour), on top of the batter. Start to mix by hand, then proceed to mix on low to start. Add the 1 tbsp Milk, increase speed & mix just until everything is combined. Do not over-mix.
Heat up the oven to 180°c/160c° Fan oven/350°f/Gas Mark 4.
Now in a small bowl add about 1 tsp water to the jam/jelly and mix to combine. Just enough to thin slightly, but will depend on how thick and jelly-like your jam is. See the video for the consistency.
Add about 4 individual teaspoons of the jam to the top ofthe batter in separate drops over the top. Then use a baking spatula to gently lift the batter from the bottom of the bowl, and fold over the top of the jam. No beating of the batter, but rather a brief gentle folding over motion. Then add in 3 more drops of the jam to the batter and fold in gently again. Add 2 more drops and hold back the remaining jam.
Oil or grease your baking tins well, paying particular attention to the sides. Place a circular piece of baking/parchment paper on the bottom of the tin. I recommend homemade lining paste/cake goop or FryLight cooking spray to grease. See my video for how to cut the paper circles. Now spoon the batter evenly between the two tins and smooth out. Using a small spoon, drop spoonful’s of the reserved jam/jelly over the top of the cake batter. See video or step-by-step photos above. You can use a cocktail stick/tooth pick to make gentle swirls in the top of the batter if you like. Tap the tins a few times on the counter/worktop to expel any trapped air.