Prepare the dough: Place yeast, sugar, and water in a mixing bowl. Cover and proof 10 minutes.

Add all remaining dough ingredients. Mix until a smooth dough forms; knead well.

Let dough rise for 30 minutes.

Prepare the filling: In a separate bowl, mix spinach and cheese together.

Prepare the topping: Place butter, milk, and garlic in a small saucepan. Melt over low heat, stirring frequently. (You can also do this in a disposable pan in the oven heated to 200 degrees Fahrenheit.) Remove from heat; stir in seasonings.

Divide dough into 16 pieces. Roll each piece into a circle. Place about 3 tablespoons filling in the center; pinch dough to enclose and form a ball.

Dip each ball into the butter topping to coat. Arrange in a single layer in a 9×13-inch pan.

Let rise for 30 minutes.

Preheat oven to 400 degrees Fahrenheit.

Bake for 25 to 30 minutes, until browned.