Avocado Toast with Poached Egg

Ingredients:

4 Slices of Sourdough Bread, or any kind of bread you prefer
4 Eggs
1 Avocado
1 Tbsp of Parsley
2 tsp of Lemon Juice
Salt and Pepper, To taste
1 Tbsp of Distilled White Vinegar
1 Tbsp of Unsalted Butter, softened at room temperature