Dad's Onion Pie

Directions

1. 1
   Preheat oven to 350 degrees F (175 degrees C).
2. 2
   Fit the pie crust into a 9-inch pie dish.
3. 3
   Melt the butter in a large skillet over medium-low heat, and cook, stirring often, until the onion slices are slightly browned at the edges, about 15 minutes.
4. 4
   Allow to cool, and arrange the onion slices into the bottom of the pie crust.
5. 5
   In a bowl, beat the eggs thoroughly with milk, salt, and about 1 1/4 cup of sour cream.
6. 6
   Mix the remaining 1/4 cup of sour cream with flour in a small bowl until thoroughly combined, and whisk the flour mixture into the egg-sour cream mixture.
7. 7
   Pour the mixture over the onions in the pie crust.
8. 8
   Bake in the preheated oven until set, about 45 minutes.