1-First Step: Toast and grind hazelnuts. Spread 1 cup hazelnuts on a baking sheet. Toast at 350°F for 8-10 minutes until fragrant. Cool slightly, then pulse in food processor to fine crumbs like almond flour. Avoid over-processing to prevent paste. This step unlocks deep flavor, key to homemade mini hazelnut cookies. Takes 15 minutes total. Pro tip: Rub off skins post-toast for smoother texture.

2-Second Step: Cream butter and sugar. Beat 1/2 cup softened butter and 1/2 cup brown sugar until light and fluffy, about 2-3 minutes. Scrape bowl often. This aerates dough for tender results. Use paddle attachment on mixer or sturdy spoon. Common mistake: Cold butter leads to gritty texture.

3-Third Step: Add wet ingredients. Mix in 1 egg and 1 tsp vanilla until smooth. Egg adds moisture; vanilla enhances nuttiness. Beat 1 minute. If dough looks curdled, keep mixing it smooths out.

4-Fourth Step: Combine dry ingredients. Whisk 1 1/2 cups flour and 1/2 tsp baking soda in a bowl. Fold into wet mixture gradually with ground hazelnuts. Stir until just combined no dry spots. Dough will be sticky; that’s normal for hazelnut sea salt shortbread style chew.

5-Fifth Step: Chill the dough. Wrap dough in plastic, refrigerate 30 minutes. Chilling prevents spreading, ensures crisp edges. Use this time to clean up. For make-ahead, chill overnight.

6-Sixth Step: Scoop and shape. Preheat oven if off. Scoop 1-inch dough balls (use small cookie scoop for uniformity). Place 2 inches apart on parchment-lined sheets. Flatten slightly to 1/2-inch thick with fork or glass bottom dipped in sugar.

7-Seventh Step: Add sea salt and bake. Sprinkle flaky sea salt generously on tops. Bake at 350°F for 10-12 minutes. Edges golden, centers soft. Rotate sheets halfway for even baking. Overbaking dries them out.

8-Final Step: Cool and serve. Cool on sheets 5 minutes, then transfer to wire racks. Enjoy warm or store. Pair with milk, coffee, or ice cream. Perfect for parties stack in towers for visual pop. Troubleshooting: Flat cookies? Chill longer. Pale? Add bake time.