Heat 2 Tbsp olive oil in a large pot over medium heat. Add scallions & onion; saute until translucent, about 5-6 minutes.
Add spinach & saute until just wilted.
Remove from heat, let cool slightly. Transfer to a mesh strainer & squeeze as much excess water as possible from the spinach.
Transfer spinach to a large mixing bowl. Crumble feta into small pieces and add to spinach mixture. Add dill and mix gently to combine. Add eggs and pepper to the spinach mixture; combine well.
Place phyllo dough cups into non-stick mini muffin pans.
Fill cups with spinach mixture.
Bake for 12-20 minutes until filling is set but before phyllo cups are too brown.
Cool for 5-10 minutes and serve.
Notes
Adapted from It's All Greek to Me by Debbie Matenopoulos.