Prep the crockpot: Lightly coat the inside of a 5–6 quart slow cooker with nonstick spray or butter to prevent sticking.
Mix the wet ingredients: In a large bowl, whisk together the eggs, melted butter, and vanilla until smooth.
Add the cake mix: Sprinkle in the dry cake mix and a pinch of salt.
Stir until just combined. The batter will be thick—don’t overmix.
Fold in the cherries: Gently fold in the cherry pie filling and chocolate chips. Try not to break up the cherries too much.
Transfer to the crock: Pour the batter into the prepared slow cooker and smooth the top with a spatula.
Cook low and slow: Cover and cook on LOW for 2.5–3.5 hours, or until the edges are set and a few moist crumbs stick to a toothpick inserted near the center.
The middle should look glossy and fudgy, not dry.
Rest before serving: Turn off the heat and let the cake sit, covered, for 10–15 minutes to set slightly.
Serve warm: Spoon into bowls and top with ice cream or whipped cream if you like.