Preheat oven to 400 degree Fahrenheit
Break apart phyllo dough a large bowl and set aside
Combine yogurt, baking soda, feta, and eggs in a large mixing bowl and set aside ("egg mixture")
Take 1/3 phyllo dough and cover bottom of a buttered pan
Layer half of egg mixture with yogurt and baking soda
Add 1/3 of chopped butter on top of the layer of egg mixture
Add another 1/3 of phyllo dough
Adding remaining half egg mixture
Add another 1/3 of chopped butter
Add final 1/3 phyllo dough
Add remaining chopped butter on top
Bake for 30 minutes in 400 degree Fahrenheit oven
Remove from oven once browned and solid, and let rest for about 30 minutes until it is near room temperature