Step 1

Preheat your oven to 400 degrees F (200 degrees C).

Step 2

Lay the bacon out onto a rimmed baking sheet. Bake for 14 to 16 minutes, or until crisp and golden brown. Transfer the bacon to a piece of paper towel and set aside to cool.

Step 3

Meanwhile, mince 2 cloves of the garlic and add them along with the vinegar to the baking sheet and stir into the bacon fat. Add the mushrooms and toss to coat. Season with salt and pepper and bake for 15 to 20 minutes, or until golden brown.

Step 4

In the bowl of a food processor, combine the beans, basil, chives, Parmigiano-Reggiano, lemon zest, lemon juice and olive oil. Roughly chop the remaining 2 cloves of garlic, add to the food processor and blitz well until smooth and spreadable, scraping down the sides of the bowl a few times throughout. Add in 2 tablespoons of water and blitz to combine. If the mixture is still a bit thick, add in the remaining 2 tablespoons of water then season to taste with salt and pepper.

Step 5

Spread the flatbreads with Dijon mustard and top each with a good helping of the herby white bean spread. Scatter over some roasted mushrooms and crumble 2 slices of bacon over each flatbread. Finish with the arugula or basil and season with salt and pepper and a little extra virgin olive oil, if desired.