In a mixing bowl, whisk together sourdough discard, milk, honey, and olive oil.
Add flour, garlic powder, and salt. Mix until combined.
Knead for about 3 minutes until the dough is smooth and slightly sticky.
Shape into a ball and place in a lightly oiled bowl. Cover and let rest in a warm place for 2 hours.
Line a baking sheet with parchment paper.
Divide dough into 8 equal pieces. Roll each into a 12–15 inch rope and tie into knots.
Place on baking sheet, brush with olive oil, cover, and rest 30 minutes.
Preheat oven to 450°F (230°C).
Bake for 12–14 minutes until lightly golden and cooked through.
Meanwhile, melt butter over low heat, add garlic, cook briefly, then stir in salt and parsley.
Brush warm garlic butter over baked sourdough discard garlic knots and serve immediately.