Cut the potatoes and peppers into 3 cm pieces. Scatter them into a large baking tray.
Cut the onion into wedges. Add these to the pan.
Lightly smash the garlic cloves - put these between the veggies. Cut a slit into the chilli, add to the pan.
Dust with your chosen chopped herb, season with salt and pepper, then drizzle with oil.
Coat everything well, then roast in a medium hot oven for 30-35 minutes until golden.
When the roasted vegetables are ready, pop the garlic cloves out of their skin and rub the flesh into the vegetables.
Serve warm.