Prepare the pan. Line an 8x8 inch baking pan with parchment paper.
Heat the heavy cream and honey. In a small saucepan, heat the heavy cream and honey until it gently simmers. Be careful to not let the heavy cream reach a boil.
Add simmered heavy cream to white chocolate. In a heatproof bowl, add the white chocolate chips. Next, slowly pour the simmered heavy cream into the bowl with the chocolate chips. Stir with a rubber spatula until thoroughly combined and the chocolate has melted and is creamy.
Sift the matcha powder. Using a fine-mesh, sieve sift the matcha powder into the mixture. Gently fold with a rubber spatula and mix until the color is homogenous and there are no more lumps.
Pour the melted matcha chocolate and chill. Carefully pour the matcha chocolate into the lined baking tin, cover with plastic wrap, and chill in the refrigerator for 3-4 hours or until firm or overnight.
Cut the chocolate. Using a hot knife (Dip the knife in hot water, then wipe the water with a kitchen towel), slice the chocolate into squares. I used a ruler for perfect 1x1 inch squares.
Dust matcha powder. Using a fine sieve, dust with matcha powder on the top of the chocolate.
Store and serve. Package the chocolate in an airtight container and store it in the refrigerator. For best results, serve cold.