In a large bowl, combine 2 cups warm water, the yeast packet, 2 tablespoons sugar, 3 tablespoons powdered milk, and 2 cups flour. Mix very well, then let the mixture rise for 15 minutes in a warm place (you can preheat the oven, turn it off, and place the bowl inside).

Remove the bowl from the warm place. Add the remaining 3 cups flour and mix. Gradually add the oil while kneading until the dough comes together smoothly and feels very soft.

After kneading, divide the dough into two equal portions. Place each half in a separate bowl, cover with a towel, and let them rest in the warm oven for 30 minutes.

Lightly flour your work surface. Roll out one portion of dough with a rolling pin, then cut it into triangles like pizza slices. Place a piece of white cheese (any kind) at the wide end of each triangle and roll up into a crescent shape. Repeat with the second portion of dough.

Place all the croissants on a large, greased baking sheet. Brush them with the beaten egg mixed with vanilla and a splash of milk, then sprinkle with nigella seeds. Let them rest while you preheat the oven, then bake until golden and cooked through.

Remove from the oven when done. Enjoy—they taste amazing!