Clean baby bella mushrooms with a damp paper towel - never soak them or they'll absorb water. Slice thick, about ¼ inch, so they don't shrivel during cooking. Pat completely dry or they won't sear properly. Let them sit at room temperature while you prep everything else. This prevents cold mushrooms from lowering the pan temperature.

Slice onions thick so they don't disappear during cooking. Mince garlic fresh - pre-minced tastes like nothing. Mix Worcestershire, soy sauce, and spices in a small bowl. Have everything ready before you start cooking. Don't skip the mise en place or you'll burn something while scrambling for ingredients.

Heat oil in a large skillet over medium-high heat until it shimmers. Add mushrooms in a single layer - don't overcrowd or they'll steam. Don't touch them for 3-4 minutes until they develop deep golden color. This takes patience - moving them too early prevents proper browning. Add onions and cook another 2 minutes until they start softening.

Add butter and garlic to the pan - should sizzle immediately. Pour in your sauce mixture and toss everything together. Cook 2-3 minutes until garlic is fragrant and sauce coats everything. Taste and adjust seasoning as needed. Should have a golden crust and rich, savory flavor when done right.