Preheat your oven to 350°F. While it warms, pull the cream cheese out of the fridge and let it sit on the counter for five minutes so it softens enough to whip without lumps. Cold cream cheese resists blending and you'll end up with frustrating chunks in your spinach artichoke dip crowd recipe.
Place softened cream cheese in a large bowl and beat with an electric mixer on medium speed for two full minutes. Watch as it transforms from dense to fluffy—this aeration is what prevents a gluey, dense final texture. Add sour cream and mayonnaise, then beat for another minute until completely combined and no streaks remain.
Fold in the thawed, squeezed-dry spinach using a rubber spatula. This matters because aggressive stirring at this stage can break down delicate greens into tiny pieces that disappear into the background flavor-wise. Gentle folding preserves visible spinach texture throughout your spinach artichoke dip crowd recipe.
Add minced garlic, chopped onion, artichoke hearts, and lemon juice to the bowl. Stir gently until distributed evenly. The lemon juice prevents the artichokes from browning and oxidizing while baking, which keeps that fresh, bright taste intact.
Fold in mozzarella cheese, parmesan cheese, black pepper, and red pepper flakes using minimal strokes. Over-mixing at this point can make the cheese distribute unevenly, leaving some bites cheesy and others bland. I used to stir vigorously here, then learned the hard way that restraint wins.
Transfer the mixture to a 9-by-13-inch baking dish or similar 2-quart vessel. Smooth the top with your spatula. The spinach artichoke dip crowd recipe should fill the dish about three-quarters full, leaving room for gentle bubbling around the edges.
Bake for 32 to 35 minutes until the top turns light golden and the edges bubble steadily. The center will still jiggle slightly when you tap the pan—that's correct. It continues cooking as it cools and firms up perfectly for scooping.
Let the spinach artichoke dip crowd recipe rest at room temperature for five minutes before serving. This prevents your guests from burning their mouths on the molten interior while allowing just enough time for the structure to set.