In a bowl, beat together the butter and two sugars with an electric mixer until the colour lightens (about 2–3 minutes). Whisk in egg and vanilla.
In another bowl, mix the oats with the flour, baking soda and salt.
Use a wooden spoon to add the dry ingredients to the wet ingredients and stir until well combined.
Scoop cookie dough into 14 balls using about 45 ml (3 tbsp.) for each, spacing them about 7.5 cm (3”) apart on two large sheet pans lined with parchment paper. Slightly flatten the balls.
Bake for 12–13 minutes. Remove from the oven and let cool on a wire rack.
Follow the instructions on the package to heat the mini fondue in the microwave.
Drizzle the fondue over the cookies. Let sit for 20–30 minutes, until chocolate is set.