Preheat oven to 350°F and line a muffin tin (12) with nonstick spray or muffin cups.
Add dry ingredients and lemon zest to a small bowl and whisk to combine.
Add eggs, heavy cream, vanilla, and sweetener to a large bowl or stand mixer. Beat for 1 minute until light and fluffy. Slowly drizzle in melted butter and fresh lemon juice.
With a mixer on low, begin to add dry ingredients to wet ingredients in small batches. Beat for 10-15 seconds. Let sit for 5 minutes. Stir in poppy seeds. Portion and divide batter into muffin pan.
Remove Perfect Keto bar from wrapper and break into very small pieces. Crumble pieces onto tops of each muffin. Add chopped almonds.
Bake for 18-20 minutes until golden brown on the edges and a toothpick comes out clean when poked through the center of each lemon muffin.