01 - Set oven to 350°F and line a muffin tin with paper liners.
02 - In a large mixing bowl, whisk together flour, matcha powder, granulated sugar, baking powder, baking soda, and salt until evenly blended.
03 - In a separate bowl, whisk together eggs, vegetable oil, whole milk, and vanilla extract until fully incorporated.
04 - Pour wet mixture into dry ingredients and gently stir until just combined without overmixing.
05 - Divide batter evenly into muffin cups and bake for 18 to 20 minutes, or until a toothpick inserted in the center comes out clean. Cool muffins completely.
06 - In a medium bowl, whisk together pumpkin puree, heavy cream, powdered sugar, cinnamon, ginger, nutmeg, and salt until a smooth cream forms. Refrigerate until ready to use.
07 - In a chilled bowl, use an electric mixer or whisk to beat heavy whipping cream, powdered sugar, and vanilla extract until soft peaks hold. Keep cold until assembly.
08 - Cut cooled matcha muffins into small cubes. Layer muffin cubes, pumpkin cream, and whipped cream in serving glasses or trifle dishes, repeating layers as preferred.
09 - Top with roasted pumpkin seeds and a dusting of matcha powder if desired. Serve immediately or chill assembled trifles for up to 2 hours before serving.