Preheat and prep: Heat your oven to 350°F (175°C). Line a 12-cup muffin pan with paper liners or lightly grease with butter or coconut oil.
Whisk the dry ingredients: In a large bowl, whisk 2 cups almond flour, 2 tablespoons coconut flour, 1/3 cup cocoa powder, 1/2 to 2/3 cup keto sweetener (adjust to taste), 2 teaspoons baking powder, and 1/4 teaspoon salt.
Break up any lumps.
Mix the wet ingredients: In another bowl, whisk 3 large eggs, 1/2 cup almond milk, 1/3 cup full-fat Greek yogurt or sour cream, 1 teaspoon vanilla extract, and 1/3 cup melted butter (cooled) until smooth.
Combine: Pour the wet mixture into the dry. Stir until just combined. The batter will be thicker than traditional muffin batter, but still spoonable.
If it seems too thick, add 1 to 2 tablespoons more almond milk.
Fold in the good stuff: Gently fold in 1/2 cup diced strawberries and 1/3 cup sugar-free chocolate chips. Don’t overmix; you want even distribution without deflating the batter.
Fill the pan: Divide the batter among the muffin cups, filling each about 3/4 full. Top with a few extra strawberry bits or chips for a pretty finish.
Bake: Bake for 18–22 minutes, or until the centers are set and a toothpick comes out with a few moist crumbs (not wet batter).
Check at 18 minutes; almond flour browns fast.
Cool: Let muffins cool in the pan for 10 minutes, then transfer to a wire rack to cool completely. They firm up as they cool, so resist cutting in too soon.
Taste and adjust: If you prefer them sweeter, serve with a light dusting of powdered erythritol or a drizzle of melted sugar-free chocolate.