1-First Step: Activate the yeast Start by dissolving 7 g active dry yeast in 200 ml lukewarm milk. Let the mixture sit for about 5 minutes, or until it looks foamy on top. That foam tells you the yeast is alive and ready to work. If the milk is too hot, it can kill the yeast, so aim for warm, not steaming. This step matters for the final texture. Good yeast activity gives the Belgian Croustillons their light center and helps them rise during the resting time. If you are making these for a crowd, do not rush this part.

2-Second Step: Mix the dry ingredients In a large bowl, combine 250 g all-purpose flour, 10 g granulated sugar, and 5 g salt. Stir them together so the sugar and salt are spread evenly through the flour. This helps each bite taste balanced instead of overly sweet in one spot and bland in another. If you want to add a small variation later, like a pinch of cinnamon, this is the right stage to do it. For the classic version, keep the base simple and let the vanilla shine.

3-Third Step: Bring the batter together Pour the foamy yeast mixture into the dry ingredients. Add 1 egg, 1 teaspoon vanilla extract, and 1 tablespoon melted butter. Stir until the batter looks smooth and well mixed. The mixture will be thicker than pancake batter but still soft enough to drop by spoonfuls. At this point, you should see the batter take on a glossy look. That is the butter and egg doing their job. If the batter seems too stiff, you can check that the milk was measured correctly and that no flour was left dry at the bottom of the bowl.

4-Fourth Step: Let the batter rest Cover the bowl and let the batter rest for 45 minutes in a warm place. During this time, the yeast works and the batter becomes lighter. This is where the fluffiness happens, so give it the full rest even if you are tempted to fry early. A warm, draft-free spot is best. You can place the bowl near a turned-off oven or in a cozy kitchen corner. Busy parents and working professionals can use this resting time to get the oil ready, set the table, or brew coffee.

5-Fifth Step: Heat the oil safely Pour enough vegetable oil into a deep pan or pot for frying. Heat it to 180°C, which is the sweet spot for Belgian Croustillons Fried Dough Balls. If the oil is too cool, the dough balls absorb more oil and become greasy. If it is too hot, they brown too fast outside and stay raw inside. If you want a safety reference for deep frying, this deep-fat frying safety guide is a helpful resource. A thermometer is the easiest way to keep the temperature steady.

6-Sixth Step: Fry in small portions Drop small portions of batter into the hot oil. Do not crowd the pan. Fry for 3 to 4 minutes, turning occasionally until the dough balls are golden brown all over. Small batches help the oil stay hot, which keeps the texture crisp instead of soggy. Use two spoons or a small scoop to shape the batter into rough balls. They do not need to look perfect. In fact, a little unevenness gives them a charming homemade look. If you are cooking for seniors or children, keep the pieces on the smaller side so they are easy to eat.

7-Seventh Step: Drain and finish Remove the fried dough balls with a slotted spoon and drain them on paper towels. While they are still warm, dust them generously with powdered sugar. Serve immediately for the best taste and texture. The first bite should be crisp, then soft, then lightly sweet. That fresh-from-the-pan moment is exactly what makes Belgian Croustillons such a favorite at fairs and markets. If you like a richer finish, serve them with chocolate sauce or honey on the side.