Preheat the oven. Set to 375°F (190°C).
Line a baking sheet with parchment paper to prevent sticking.
Melt the cheeses. In a microwave-safe bowl, combine mozzarella and cream cheese. Microwave in 30-second bursts, stirring between each, until smooth and stretchy, about 1–2 minutes total.
Mix the dry ingredients. In a separate bowl, whisk almond flour, baking powder, salt, garlic powder, and onion powder.
Form the dough. Add the dry mixture and the egg to the melted cheese. Stir with a stiff spatula, then switch to clean hands.
Knead until a cohesive dough forms. If it resists mixing, microwave the dough for 10 seconds to soften and continue kneading.
Shape the breadsticks. Lightly oil your hands. Divide the dough into 10–12 pieces.
Roll each into a 5–6 inch log and place on the lined sheet, spaced slightly apart.
Make the garlic butter. Stir melted butter with minced garlic, parsley, and a pinch of red pepper flakes. Brush half of it over the unbaked sticks. Sprinkle with Parmesan.
Bake. Bake 12–15 minutes, until puffed and lightly golden on the edges.
Brush with the remaining garlic butter while hot.
Rest and serve. Let them sit for 5 minutes to set the texture. Serve warm with sugar-free marinara or ranch.