Heat olive oil in a frying pan over medium heat. Add minced garlic and saut? until fragrant.

Add chopped Swiss chard and cook until wilted. Remove from heat and let cool.

In a mixing bowl, combine the cooled Swiss chard, feta cheese, ricotta cheese, beaten eggs, oregano, salt, and pepper. Mix well.

Preheat the oven to 375?F (190?C).

Brush a tart pan with melted butter. Layer phyllo dough sheets in the pan, brushing each layer with melted butter.

Pour the filling into the prepared crust and spread evenly.

Fold the edges of the phyllo dough over the filling.

Bake in the preheated oven for 30-35 minutes or until the crust is golden brown.

Remove from oven and let cool slightly before slicing.