Preheat your oven to 350°F (175°C) to ensure even baking.
In a microwave-safe bowl, melt the butter until completely liquid (30 seconds to 1 minute).
Combine melted butter and sugar in a mixing bowl. Mix until well combined, then add eggs and almond extract, whisking until smooth.
Gradually add flour to the wet mixture, stirring gently until just combined.
Pour the batter into the prepared baking dish and sprinkle sliced almonds on top.
Bake for about 20-25 minutes or until a toothpick inserted in the center comes out clean.
Let the cake cool for a few minutes, then dust with powdered sugar before serving.
