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Preheat oven to 350 degrees F. Line 9x13-inch sheet pan or baking dish with parchment paper.
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In large bowl, whisk together pumpkin purée, honey, melted oil, vanilla and eggs until smooth.
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Stir in almond flour, arrowroot, baking powder, baking soda, spices and salt. Mix until combined into thick, even batter.
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Pour batter evenly into prepared pan and smooth top. Bake 28-33 minutes, or until golden and toothpick inserted in center comes out clean. Cool completely before frosting.
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In medium bowl, beat palm shortening until creamy.
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Add powdered monk fruit and vanilla; mix until fluffy and smooth.
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Add almond milk, 1 tablespoon at a time, until creamy consistency is reached. Spread frosting evenly over cooled cake and sprinkle generously with chopped pecans. Sprinkle with extra cinnamon as desired.