Boil a large pot of unsalted water + gently loosen fusilli; boil 2-3 min til al dente; drain

Wipe mushrooms clean, thinly slice; heat 1 tbsp oil in a skillet over high, add mushrooms + cook undisturbed 3 min; sauté 3-4 min til browned + tender, season with salt/pep + set aside

Heat 1 tbsp oil in large skillet over med-high + sauté ½ of spinach + salt/pep 1-2 min; add other ½ + cook 1-2 min more til wilted; combine spinach with mushrooms + season with salt/pep

Heat a skillet over med + add 2-4 tbsp butter; cook butter while stirring til browned 2-3 min; toss pasta with brown butter + salt/pep

Divide pasta between 2 bowls + top with veggies