►Heat oven to 375°F. Grease a muffin tin and set aside. Place 1 wonton wrapper in each cup of the muffin tin.
►Add olive oil and butter to a saucepan set over medium heat. Once butter has melted, add onions, red wine vinegar, and 1 cup water. Cook until onions are caramelized, about 30 minutes. If liquid reduces before onions have finished caramelizing, continue adding water ¼ cup at a time.
►Combine beef stock, 1⁄3 of your chopped thyme, and cornstarch in a saucepan. Simmer over medium heat, stirring occasionally. Meanwhile, cut Fromager d’Affinois Garlic & Herbs into ½-inch cubes. Slice roast beef into ½-inch ribbons and then in thirds to make little rectangles.
►Divide onions in half. Add roast beef and half the remaining thyme to half the onions and stir until evenly mixed. Bake the wonton wrappers according to package directions. Just before wonton wrappers have finished baking, add cubed Fromager d’Affinois Garlic & Herbs to the onions and roast beef, mixing just until the cheese just begins to melt. Fill wonton wrappers with mixture. Remove cups from the muffin tin and top with reserved caramelized onions and remaining chopped thyme. Serve with jus on the side for dipping.