Finely chop your chocolate and place it in a heatproof bowl. The smaller the pieces, the smoother the ganache.
In a small saucepan, warm the heavy cream over medium heat until it’s steaming but not boiling. Small bubbles should appear around the edges.
Pour the hot cream over the chocolate. Let it sit for 2–3 minutes to gently melt.
After sitting, start whisking from the center outward until smooth and glossy. Add corn syrup or coconut oil at this stage if using.
For a pourable glaze, use immediately while warm.
For a spreadable, or whipped ganache, let it cool at room temperature or refrigerate until thickened.