Disclosed are microwave popcorn articles including thaumatin to provide improved texture and flavor. The articles can include a hydrogenated fat, liquid oil and/or a thickened liquid (at room temperature) oil and their methods of preparation. The microwave popcorn articles comprise any conventional microwave popcorn bag or container, and a food charge disposed therein comprising kernel popcorn and/or puffable pellets; 1% to 45% liquid (at room temperature) oil; and, 0% to 4% salt. The oil ingredient has a melting point of .ltoreq.25.degree. C. The oil ingredient includes an oil thickening ingredient especially a starch based oil thickening ingredient such as a cyclodextrin in amounts sufficient to dimensionally stabilize the oil. By avoiding hydrogenation to solidify the oil into a solid fat at room temperatures, finished popcorn products can be provided that are desirably low in trans fatty acid content. The methods of preparation include preparing a heated oil thickened with cyclodextrin complexed with the oil and adding the thickened oil to the microwave container.