This focaccia is super savoury, full of herbs and topped with lightly caramelized onions. Perfect for a holiday dinner, making leftover turkey sandwiches or eating on its own!
Using a small pot or kettle heat the water to a simmer before mixing with the bouillon cube until it has completely disolved then set aside and allow to cool to 100F-110F.
Finely chop the herbs until you have 1/2 cup then set aside. Don't worry too much about how much of each you have, as long as there is a bit of variety that's perfect! This is a great opportunity to use up what's hanging around your fridge or garden.
Add the bread flour, yeast and cooled bouillon to the bowl of a stand mixer. Using the hook attachment mix on low until no loose flour remains. Increase the speed to medium-high and knead until the dough is smooth, clings to the hook and clears the side of the bowl. This will take around 15 minutes but it's more important to pay attention to the look of the dough than the time.Reduce the speed of the mixer to low then add half of your chopped herbs and mix until combined.Transfer the dough to a bowl with 2 Tbsp of the olive oil and use your fingers to spread the oil to the surface, cover the bowl and allow to double in size, this will take about an hour.
Meanwhile, thinly slice your onions and add them to a medium-sized pan over medium heat with 2 Tbsp of the olive oil and a generous pinch of salt.Cook the onions stirring occasionally for 25-35 minutes until soft and amber in colour. If you notice the onions are sticking to the pan lower the heat to medium-low as the goal is a slow and even cook. If some bits are sticking to the bottom of the pan you can add a splash of water to lift them up and reincorporate the flavour into the onions. When the onions are finished cooking remove them from the heat, stir in the remaining chopped herbs and transfer to the fridge once cool.
Once the dough has doubled in size coat a 9x13 pan with 2 Tbsp of olive oil and gently transfer the dough to the pan. Carefully stretch the dough to reach the corners the best you can without overly deflating the dough. It's okay if it doesn't fully fill the pan, the dough will spread and grow during the second rise.Cover and allow to double in size again.
While the focaccia is in its final rise preheat the oven to 450F.Once it has doubled drizzle the final 2 Tbsp of olive oil onto the surface and use your fingers to dimple the dough gently then place the caramelized onion and herb mixture onto the surface and sprinkle with flaky salt.Bake on the middle rack for 20-25 minutes until the bread is golden, pulls away from the edges of the pan and is at least 200F when checked with a thermometer.Enjoy!