Cheddar and Roasted Onion Bites

wheat flour 16.9% , unsalted butter 13.9% , mature cheddar 13.9% , onion 12.0% , yeast 8.4% , spirit vinegar 8.4% , whole milk powder 2.9% , sugar 1.8% , white wine vinegar 1.8% , sea salt 1.8% , free range eggs 1.8% , mushroom powder 1.8% , yeast extract 1.3% , wheat flour 1.3% , barley malt extract 1.3% , spice 0.0% , salt 0.0%