I found this recipe on a popular site and it works well. I like to double up the recipe as the yield is small so tailor it to your needs.

Ingredients
1/2 cup white vinegar
2 rounded teaspoons sugar
1 teaspoon mustard seed
1 teaspoon salt
1 clove garlic
2 tablespoons fresh dill leaves, chopped or snipped
1 bay leaf
4 Kirby cucumbers, cut into 1-inch slices on an angle

Directions
Heat small saucepan over medium high heat. Add vinegar, sugar, mustard seed, salt, and garlic to the pan and cook until it begins to simmer and sugar dissolves. Toss the dill, bay leaf, and sliced cucumbers together in a heat-proof bowl. Pour the simmering liquid over the cucumbers and stir to evenly coat. Allow to cool to room temperature or chill before serving.