Before you plan to bake, take the mascarpone cheese and butter out of the fridge and leave it on the counter for about 15 minutes to soften. Do the same with the eggs until they no longer have the fridge's chill.
Preheat the oven to 350 °F (180°C).
Butter the baking pan, then shake in a bit of cacao powder (coating all sides) and tap out the excess—reserve.
Combine the almond flour, cacao powder, and baking soda in a bowl. I like to use a whisk to sift and remove any big lumps. Set aside.
Add the mascarpone cheese and melted butter to a mixing bowl and whisk until smooth.
Add the lightly beaten eggs, followed by the sweetener. Whisk until you have a beautifully soft, creamy texture.
Combine the dry ingredients with the wet ingredients—you can use the same whisk or fold with a spatula.
Lastly, stir in the chopped fresh strawberries.
Pour the batter into the prepared and reserved baking pan.
Tap the bottom of the pan a few times against the counter to even out the cake batter and eliminate any major air bubbles.
Bake for 45 to 47 minutes, or until the middle is firm to the touch and an inserted toothpick comes out clean.
Let the cake cool before removing it from the baking pan. It does not have to be thoroughly cooled but enough to have settled in its form. Otherwise, the cake will break.
Dust with powdered Monk fruit sweetener (optional) and garnish with fresh berries of your choice (highly recommended).