First Step: Prepare the Dough and Pan Chill your pie dough for at least 2 hours or thaw store-bought crust as required. Preheat the oven to 375°F (190°C). Grease one or two 24- or 48-count mini muffin pans with nonstick spray to prepare for the crust placement.

Second Step: Cut and Line the Crusts Roll out your pie dough into a 12-inch circle on a floured surface. Using a 2.5-inch round cookie cutter or biscuit cutter, cut out rounds from the dough. Press each round into the mini muffin cups, ensuring it is flat on the bottom and fits snugly up the sides without tearing.

Third Step: Whisk the Egg Mixture In a mixing bowl, whisk together 4 large eggs, ½ cup whole milk, ½ cup heavy cream, ½ teaspoon salt, and ¼ teaspoon black pepper until fully blended. Refrigerate this custard mixture while you prepare the fillings.

Fourth Step: Add Fillings Evenly distribute your chosen add-ins such as diced ham, cooked bacon, wilted spinach, sautéed mushrooms, chopped scallions, or diced peppers into each dough-lined cup. Sprinkle about 1 tablespoon of shredded or crumbled cheese atop the fillings. Placing ingredients on top rather than mixing into the custard helps prevent sinking during baking.

Fifth Step: Fill with Custard and Bake Gently pour the chilled egg mixture into each cup, filling nearly to the top but leaving about ¼ inch of space to allow for slight expansion as they bake. Place the muffin pans in the oven and bake for 25 to 28 minutes, until the centers are almost set and the crust edges turn light golden brown. For larger quiches in a 12-count pan, bake for 27 to 30 minutes.

Final Step: Cool and Serve Let the mini quiches cool for about 5 minutes in the pan to firm up. Carefully remove each quiche using a small spoon or knife to loosen the edges. Serve warm or at room temperature. Garnish with fresh herbs if desired. Adjust ingredient substitutions or baking time per dietary needs or crust variations.