Prepare the Dough: Proof the yeast by combining warm milk and sugar in a small bowl, then sprinkle the active dry yeast on top. Let it sit for 5-10 minutes until foamy.

Combine Ingredients: Whisk melted butter and eggs in a large bowl, add foamy yeast mixture, then gradually incorporate flour and salt until a rough dough forms.

Knead Dough: Turn the dough onto a floured surface and knead for 5-7 minutes until smooth and elastic.

First Rise: Place kneaded dough in a greased bowl, cover with a towel, and let rise in a warm place until doubled (about 1-2 hours).

Prepare the Filling: While the dough rises, sauté spinach in a skillet until wilted. Scramble eggs and combine with spinach and diced ham.

Shape Dough: After rising, punch down dough, divide into portions, and roll each into a 12x8 inch rectangle.

Assemble Rolls: Spread spinach and ham filling over each rectangle, roll tightly, and pinch edges to seal.

Second Rise: Place rolls seam-side down on a baking sheet, cover, and allow to rise for about 30 minutes.

Bake: Preheat oven to 350°F (175°C). Brush rolls with egg wash if desired. Bake for 20-25 minutes until golden brown.

Cool and Serve: Allow rolls to cool on a wire rack for at least 10 minutes before serving.