Heat up 2 Tbsp of olive oil and toast the bread in the pan over medium-high heat, adding the garlic towards the end. Let toast until golden brown and until the garlic stops to smell raw.
Transfer the bread to a salad bowl, add more oil to the pan, put over medium-high heat and add the herbs. Now fry the onions and add the pepper in the oil for about 5 minutes. Season with salt and pepper and let fry for a few minutes more, for extra charr. Add the nectarine slices when the rest of your veg is done and toss to combine. Take the pan off the heat.
Quarter or half the tomatoes. Toast the sunflower seeds in a pan without added oil for about 2 minutes over medium heat. Slice the cucumbers and set aside.
Mix the dressing by stirring together the last 4 ingredients. Drizzle half of it over the bread mixture and toss.
Add everything to the salad bowl with the bread chunks and toss well to combine.
Let rest 15 minutes and serve!