Preheat your oven to 350F
Gather all your ingredients, measure everything, grease your pan, then set aside.
In a cooking pot add in lactose free butter and chocolate. Melt in low heat, do not bring to a boil. Once the pot is warm enough and the butter and chocolate start to melt remove the pot off the stove and allow everything to melt before pouring into the dry batter.
In a mixing bowl, add flour, salt, sugar, and cocoa powder, use a whisk to remove any lumps.
Using a small bowl, crack all four eggs then pour the eggs into the batter and mix using a handheld mixer or spatula.
Once the chocolate and butter has melted, pour the entire mixture into the dry ingredients and mix well using either a spatula or hand mixer.
Chop the Lindt chocolate into small pieces and toss them into the batter and fold them in using a spatula.
Pour the entire batter into a rectangular oven safe pan and bake for about 30-35 minutes.
Use a toothpick and insert it into the middle of the brownie batter. You want your toothpick to come out somewhat dirty.