Place butter, garlic, onion into the Thermomix bowl and chop 2 sec/speed 6.
Saute 5 min/Varoma/speed 1/MC OFF.
Add mushrooms, seasoning, thyme sprigs, water and chicken stock powder. Cook 8 min/100°C/Reverse/speed 0.5.
Add chicken and cream and cook *6 min/100°C/Reverse/speed 0.5. Add as much spinach or rocket as you can fit into the bowl and put the lid back on. Allow the greens to wilt without stirring any further.
Add the lemon juice, and serve immediately with mash, noodles or any veggies of choice. Garnish with more thyme sprigs.