Stick a toothpick on the stem end of the strawberries. Make sure the strawberries are totally dry, or the chocolate will not adhere to them.
Put your semi-sweet chocolate in a microwave safe dish. Set the microwave to half power, and heat for a minute at a time, stirring after each time. You want the chocolate just melted (too much and it will seize up on you, and become un-usable). Mine took just over 2 minutes. Once it is melted, if you choose to, add in a tablespoon of vegetable oil (this makes it more glossy, and helps with the texture).
Working quickly, hold the toothpick and dip into the chocolate about ¾ way up the strawberry. Dip the berries, and then twist them a little to get the excess chocolate off. Place on a parchment lined tray.
Put the white chocolate in a Ziploc bag. Melt in the microwave 30 seconds at a time until just barely melted. Mine took 1½ minutes. Cut a very small hole on one end and squeeze to decorate over the dark chocolate. The smaller the hole, the better. (You could also melt the chocolate in a bowl and use a fork to drizzle the white chocolate).
Set aside to dry. It takes about 30 minutes.
Recipe by To plate with love at https://toplatewithlove.com/chocolate-covered-strawberries/