1 lb (450 g) ground beef (80 / 20) 4 oz (115 g) Swiss cheese, cut into 4 pieces 8 oz (225 g) cremini or button mushrooms, finely chopped 1 small shallot, minced 1 tbsp (15 ml) butter 1 tsp fresh thyme (or 1 / 2 tsp dried) Salt and pepper to taste 4 buns
1. Sauté shallot and mushrooms in butter with thyme over medium heat until liquid evaporates and mushrooms are browned; season and cool. 2. Form beef into 8 patties, season with salt and pepper. 3. Place ~1 tbsp mushroom mixture and a piece of Swiss on 4 patties; top with remaining patties and press edges to seal fully. 4. Chill 15 minutes. 5. Grill or pan-sear over medium-high heat 3–4 minutes per side until internal temp is 160°F (71°C). 6. Rest 3 minutes, toast buns if desired, assemble and spoon extra sautéed mushrooms on top. ---
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