Line a sheet pan with parchment paper to prevent sticking.
In one bowl, whisk together non-dairy milk and apple cider vinegar. Let sit a few minutes to curdle.
In a separate bowl, mix together flour, baking powder, cinnamon, ginger, nutmeg, cloves, salt, and sugar.
Add dry mix gradually into the wet ingredients and stir until combined — avoid overmixing.
Fold in the grated carrots and raisins evenly throughout the batter.
Spread batter evenly into sheet pan. Place on steam rack inside preheated pressure cooker.
Cook at high pressure for 25 minutes. Let natural release for a few minutes before performing quick release.
Cool slightly, cut into squares, and serve with vegan cream cheese frosting or maple syrup.
Notes
Cool completely before storing. Wrap tightly and refrigerate for up to 4 days or freeze for longer storage. To reheat, microwave with damp towel or toast until warm.