Preheat and Prep: Preheat your oven to 375°F (190°C). Lightly grease an 8-cup standard muffin tin with non-stick cooking spray to ensure the baked cups slide out easily.
Prepare the Dough: Carefully unroll the crescent roll dough and separate it along the perforations into 8 individual triangles. Gently press one triangle into each prepared muffin cup, forming a sturdy base with the pointed edges slightly overlapping the top. Set aside.
Sauté Aromatics: Heat the olive oil in a large, heavy-bottomed skillet over medium heat. Add the finely diced onion and sauté for 2 to 3 minutes until softened and translucent. Stir in the minced garlic and cook for just 30 seconds until fragrant.
Brown the Meat: Add the ground beef to the skillet. Cook for 5 to 6 minutes, breaking the meat apart into crumbles with a wooden spoon, until fully browned. (If using a fattier cut of beef, drain the excess grease from the pan now).
Cook the Mushrooms: Stir the finely chopped mushrooms into the beef mixture. Cook for an additional 3 to 4 minutes. Pro Tip: Ensure that any liquid released by the mushrooms fully evaporates. This step is absolutely crucial to prevent soggy pastry cups.
Season and Thicken: Sprinkle the kosher salt, black pepper, smoked paprika, and dried thyme over the meat mixture. Reduce the heat to low. Stir in the softened cream cheese, mixing continuously until it is completely melted and smoothly coats the filling. Remove the skillet from the heat.
Assemble the Cups: Evenly distribute the warm, creamy beef and mushroom filling among the 8 crescent dough cups. Top each cup generously with the shredded cheese.
Bake to Perfection: Place the muffin tin on the center rack of the oven. Bake for 12 to 15 minutes, or until the crescent dough is puffed and deeply golden brown, and the cheese is melted and bubbling.
Cool and Serve: Remove the tin from the oven and allow the cups to cool in the pan for exactly 5 minutes. This resting period helps the melted cheese set and prevents the hot cups from falling apart. Carefully lift them out and serve warm.