In a medium bowl, mix together the cream cheese, spinach, mozzarella, salt, pepper, and garlic powder until well combined.

Line a square baking pan with parchment paper, spread the mixture evenly in the dish, and freeze for 30 minutes.

Remove the frozen mixture from the pan by inverting it onto a cutting board and peeling off the parchment paper.

Cut the frozen block into 1-centimeter wide strips, then cut those strips in half to form sticks.

Set up three bowls: one with flour, one with beaten eggs, and one with breadcrumbs.

Dip each spinach dip stick into the flour, then the eggs, then the breadcrumbs, followed by another dip in the eggs and a final coating of breadcrumbs. Place the breaded sticks on a plate.

In a pot, heat canola oil over medium-high heat. Fry the sticks for about 30 seconds to a minute, until they turn golden brown.

Allow the sticks to cool slightly before serving with marinara sauce.