Step-by-Step Instructions:

• In a mixing bowl, combine the unsalted butter, minced garlic, chopped parsley, and salt. Mix until well combined and creamy. Set aside.
• If you're making sandwiches, slice the large soft rolls in half. For hors d'oeuvres, use a cookie cutter to cut 24 circles out of your sandwich bread.
• Generously spread the garlic butter mixture on the cut sides of the rolls or on the rounds of bread.
• Slice the brie into thick pieces and layer them on one side of each roll or on half of the bread rounds.
• Add a layer of thinly sliced cucumbers and onions. The freshness of these vegetables will brighten the rich flavors of the brie and garlic butter.
• Spread a thin layer of mayonnaise on the other side of the rolls or on the remaining bread rounds.
• Close the sandwiches by placing the other half of the roll on top or add another round of bread if making hors d'oeuvres.
• For a warm, melty experience, you can toast the assembled sandwiches on a skillet or in a panini press until the bread is golden and the brie is slightly melted.
• Slice the sandwiches into halves or quarters if desired, or serve the hors d'oeuvres as is on a platter. Enjoy them warm or at room temperature!