Line your baking tray with greaseproof paper. I have used a 10x7in pan, but a 9x9in will work well.
Preheat your oven to 180°C/fan 170°C.
You're only going to need one bowl for this recipe, so in a large bowl melt your butter. Add both your sugars and combine.
Whisk through your eggs and almond extract until smooth.
We're almost there already. Add you ground almonds and plain flour and mix until just combined.
Pour the mixture into your prepared tin and spread into an even layer.
Dollop your jam randomly across the top and drag a knife through it a few times to swirl it through the blondie mixture. Sprinkle over your flaked almonds. If using, place your Jammie Dodgers across the top.
Bake in your preheated oven for 35-45 minutes until there's a slight wobble in the centre, but the edges are set. Start checking at 25 mins though in case your oven runs hot.
Leave the blondies to cool in the tin. If you take them out while they're still warm, they'll collapse.